Több kisebb terem és hálózat is szeptemberre időzítette saját versenysorozatát, köztük a WPN és a Chico hálózat mellett a független Unibet is. A termek döntésében közrejátszhatott, hogy a nagyobb termek tornái épp kifutnak szeptember közepére, így akár kisebb garantált összdíjazás is vonzó lehet a játékosok számára a nagy tornák hiányában. A GGPoker termében zajló WSOP szeptember 12-én, a PokerStars termében zajló WCOOP szeptember 14-én, míg a partypokeren zajló WPT szeptember 15-én zárul majd.
Az Unibet szeptember közepén indítja népszerű tornasorozatát, az Unibet Online Seriest (UOS), immár 13. alkalommal. Ugyan a garantált nyereményalap nem éri el a 2020-as csúcsot jelentő €1.000.000-s szintet, de a €675.000-s összdíjazás így sem számít alacsonynak.
A sorozat 105 versenyből áll majd, a fő verseny másodjára is az Unibet Open lesz, ami idén is online kerül megrendezésre, €200.000 garantált nyereményalappal, €1100-s buy-in mellett. Az Unibet volt az első szolgáltató, aki az összes 2020-as élő eseményét törölte a pandémia miatt, ezt pedig később 2021-re is kiterjesztette.
A legutóbbi májusi fordulóhoz hasonlóan a sorozat minden eseménye egy kéthetes periódusban fog lezajlani, mivel az Unibet játékosai a korábbi egy hónapig tartó változattal szemben ezt a lebonyolítási formát preferálják. Így az első versenyt szeptember 12-én rendezik és a sorozat szeptember 26-ig fog tartani.
Az Unibet Online Series XIII teljes versenykiírása:
| Dátum | Kezdés | Verseny | # | Garantált (€) | Variáns | Buy-in(€) |
| 2021.09.12 | 19:00 | €35,000 E1 UOS Rebuy High 2-Days | 1 | 35000 | Holdem | 100 |
| 2021.09.12 | 19:00 | €20,000 E2 UOS Rebuy Mid 2-Days | 2 | 20000 | Holdem | 50 |
| 2021.09.12 | 19:00 | €3,000 E3 UOS Rebuy Low 2-Days | 3 | 3000 | Holdem | 5 |
| 2021.09.12 | 19:00 | €750 E4 UOS Rebuy Nano 2-Days | 4 | 750 | Holdem | 1 |
| 2021.09.12 | 20:30 | €10,000 E5 UOS Rebuy High | 5 | 10000 | Holdem | 100 |
| 2021.09.12 | 20:30 | €5,000 E6 UOS Rebuy Mid | 6 | 5000 | Holdem | 25 |
| 2021.09.12 | 20:30 | €1,500 E7 UOS Rebuy Low | 7 | 1500 | Holdem | 5 |
| 2021.09.12 | 20:30 | €100 E8 UOS Rebuy Nano | 8 | 100 | Holdem | 0.5 |
| 2021.09.13 | 19:00 | €7,000 E9 UOS Rebuy Mid | 9 | 7000 | Holdem | 25 |
| 2021.09.13 | 19:00 | €4,000 E10 UOS Rebuy Low | 10 | 4000 | Holdem | 10 |
| 2021.09.13 | 19:00 | €250 E11 UOS Rebuy Nano | 11 | 250 | Holdem | 0.5 |
| 2021.09.13 | 20:30 | €8,000 E12 UOS Bounty Re-enter Mid | 12 | 8000 | Holdem Bounty | 50 |
| 2021.09.13 | 20:30 | €1,000 E13 UOS Bounty Re-enter Low | 13 | 1000 | Holdem Bounty | 5 |
| 2021.09.13 | 20:30 | €100 E14 UOS Bounty Re-enter Nano | 14 | 100 | Holdem Bounty | 0.5 |
| 2021.09.14 | 19:00 | €10,000 E15 UOS Big Bang High | 15 | 10000 | Holdem | 200 |
| 2021.09.14 | 19:00 | €4,000 E16 UOS Big Bang Mid | 16 | 4000 | Holdem | 25 |
| 2021.09.14 | 19:00 | €1,000 E17 UOS Big Bang Low | 17 | 1000 | Holdem | 10 |
| 2021.09.14 | 19:00 | €100 E18 UOS Big Bang Nano | 18 | 100 | Holdem | 0.5 |
| 2021.09.14 | 20:30 | €4,000 E19 UOS Bounty Re-enter Mid | 19 | 4000 | Holdem Bounty | 25 |
| 2021.09.14 | 20:30 | €1,000 E20 UOS Bounty Re-enter Low | 20 | 1000 | Holdem Bounty | 5 |
| 2021.09.14 | 20:30 | €100 E21 UOS Bounty Re-enter Nano | 21 | 100 | Holdem Bounty | 0.5 |
| 2021.09.15 | 19:00 | €6,000 E22 UOS Omaha Rebuy Mid | 22 | 6000 | Omaha | 50 |
| 2021.09.15 | 19:00 | €2,500 E23 UOS Omaha Rebuy Low | 23 | 2500 | Omaha | 10 |
| 2021.09.15 | 19:00 | €100 E24 UOS Omaha Rebuy Nano | 24 | 100 | Omaha | 0.25 |
| 2021.09.15 | 20:30 | €7,500 E25 UOS Rebuy Mid | 25 | 7500 | Holdem | 50 |
| 2021.09.15 | 20:30 | €2,000 E26 UOS Rebuy Low | 26 | 2000 | Holdem | 5 |
| 2021.09.15 | 20:30 | €100 E27 UOS Rebuy Nano | 27 | 100 | Holdem | 0.25 |
| 2021.09.16 | 19:00 | €10,000 E28 UOS Big Bang Bounty High | 28 | 10000 | Holdem Bounty | 200 |
| 2021.09.16 | 19:00 | €4,000 E29 UOS Big Bang Bounty Mid | 29 | 4000 | Holdem Bounty | 25 |
| 2021.09.16 | 19:00 | €1,000 E30 UOS Big Bang Bounty Low | 30 | 1000 | Holdem Bounty | 5 |
| 2021.09.16 | 19:00 | €100 E31 UOS Big Bang Bounty Nano | 31 | 100 | Holdem Bounty | 0.5 |
| 2021.09.16 | 20:30 | €4,000 E32 UOS Rebuy Mid | 32 | 4000 | Holdem | 25 |
| 2021.09.16 | 20:30 | €1,500 E33 UOS Rebuy Low | 33 | 1500 | Holdem | 5 |
| 2021.09.16 | 20:30 | €100 E34 UOS Rebuy Nano | 34 | 100 | Holdem | 0.5 |
| 2021.09.17 | 19:00 | €10,000 E35 UOS Bounty Re-enter High | 35 | 10000 | Holdem Bounty | 100 |
| 2021.09.17 | 19:00 | €7,000 E36 UOS Bounty Re-enter Mid | 36 | 7000 | Holdem Bounty | 25 |
| 2021.09.17 | 19:00 | €1,500 E37 UOS Bounty Re-enter Low | 37 | 1500 | Holdem Bounty | 5 |
| 2021.09.17 | 19:00 | €100 E38 UOS Bounty Re-enter Nano | 38 | 100 | Holdem Bounty | 0.5 |
| 2021.09.17 | 20:30 | €7,000 E39 UOS Re-enter Mid | 39 | 7000 | Holdem | 25 |
| 2021.09.17 | 20:30 | €3,000 E40 UOS Re-enter Low | 40 | 3000 | Holdem | 10 |
| 2021.09.17 | 20:30 | €100 E41 UOS Re-enter Nano | 41 | 100 | Holdem | 0.25 |
| 2021.09.18 | 19:00 | €10,000 E42 UOS Bounty Re-enter Mid | 42 | 10000 | Holdem Bounty | 50 |
| 2021.09.18 | 19:00 | €1,500 E43 UOS Bounty Re-enter Low | 43 | 1500 | Holdem Bounty | 5 |
| 2021.09.18 | 19:00 | €100 E44 UOS Bounty Re-enter Nano | 44 | 100 | Holdem Bounty | 0.5 |
| 2021.09.18 | 20:30 | €8,000 E45 UOS Bounty Re-enter High | 45 | 8000 | Holdem Bounty | 100 |
| 2021.09.18 | 20:30 | €5,000 E46 UOS Bounty Re-enter Mid | 46 | 5000 | Holdem Bounty | 25 |
| 2021.09.18 | 20:30 | €1,000 E47 UOS Bounty Re-enter Low | 47 | 1000 | Holdem Bounty | 5 |
| 2021.09.18 | 20:30 | €100 E48 UOS Bounty Re-enter Nano | 48 | 100 | Holdem Bounty | 0.5 |
| 2021.09.19 | 19:00 | €25,000 E49 UOS Highroller 6-Max High 2-Days | 49 | 25000 | Holdem | 300 |
| 2021.09.19 | 19:00 | €10,000 E50 UOS 6-Max Mid 2-Days | 50 | 10000 | Holdem | 50 |
| 2021.09.19 | 19:00 | €2,500 E51 UOS 6-Max Low 2-Days | 51 | 2500 | Holdem | 10 |
| 2021.09.19 | 19:00 | €250 E52 UOS 6-Max Nano 2-Days | 52 | 250 | Holdem | 1 |
| 2021.09.19 | 20:30 | €10,000 E53 UOS Rebuy High | 53 | 10000 | Holdem | 100 |
| 2021.09.19 | 20:30 | €5,000 E54 UOS Rebuy Mid | 54 | 5000 | Holdem | 25 |
| 2021.09.19 | 20:30 | €1,500 E55 UOS Rebuy Low | 55 | 1500 | Holdem | 5 |
| 2021.09.19 | 20:30 | €150 E56 UOS Rebuy Nano | 56 | 150 | Holdem | 0.5 |
| 2021.09.20 | 19:00 | €7,000 E57 UOS Rebuy Mid | 57 | 7000 | Holdem | 25 |
| 2021.09.20 | 19:00 | €4,000 E58 UOS Rebuy Low | 58 | 4000 | Holdem | 10 |
| 2021.09.20 | 19:00 | €100 E59 UOS Rebuy Nano | 59 | 100 | Holdem | 0.25 |
| 2021.09.20 | 20:30 | €2,000 E60 UOS Omaha Mid | 60 | 2000 | Omaha | 25 |
| 2021.09.20 | 20:30 | €1,000 E61 UOS Omaha Low | 61 | 1000 | Omaha | 10 |
| 2021.09.20 | 20:30 | €100 E62 UOS Omaha Nano | 62 | 100 | Omaha | 0.5 |
| 2021.09.21 | 19:00 | €10,000 E63 UOS Big Bang High | 63 | 10000 | Holdem | 200 |
| 2021.09.21 | 19:00 | €4,000 E64 UOS Big Bang Mid | 64 | 4000 | Holdem | 25 |
| 2021.09.21 | 19:00 | €1,000 E65 UOS Big Bang Low | 65 | 1000 | Holdem | 10 |
| 2021.09.21 | 19:00 | €100 E66 UOS Big Bang Nano | 66 | 100 | Holdem | 0.5 |
| 2021.09.21 | 20:30 | €4,000 E67 UOS Omaha Re-enter Bounty Mid | 67 | 4000 | Omaha Bounty | 50 |
| 2021.09.21 | 20:30 | €750 E68 UOS Omaha Re-enter Bounty Low | 68 | 750 | Omaha Bounty | 5 |
| 2021.09.21 | 20:30 | €100 E69 UOS Omaha Re-enter Bounty Nano | 69 | 100 | Omaha Bounty | 0.5 |
| 2021.09.22 | 19:00 | €7,000 E70 UOS Mid | 70 | 7000 | Holdem | 50 |
| 2021.09.22 | 19:00 | €2,000 E71 UOS Low | 71 | 2000 | Holdem | 10 |
| 2021.09.22 | 19:00 | €100 E72 UOS Nano | 72 | 100 | Holdem | 0.5 |
| 2021.09.22 | 20:30 | €7,000 E73 UOS Rebuy Mid | 73 | 7000 | Holdem | 50 |
| 2021.09.22 | 20:30 | €3,000 E74 UOS Rebuy Low | 74 | 3000 | Holdem | 10 |
| 2021.09.22 | 20:30 | €100 E75 UOS Rebuy Nano | 75 | 100 | Holdem | 0.25 |
| 2021.09.23 | 19:00 | €10,000 E76 UOS Big Bang Bounty High | 76 | 10000 | Holdem Bounty | 200 |
| 2021.09.23 | 19:00 | €4,000 E77 UOS Big Bang Bounty Mid | 77 | 4000 | Holdem Bounty | 25 |
| 2021.09.23 | 19:00 | €1,000 E78 UOS Big Bang Bounty Low | 78 | 1000 | Holdem Bounty | 5 |
| 2021.09.23 | 19:00 | €100 E79 UOS Big Bang Bounty Nano | 79 | 100 | Holdem Bounty | 0.5 |
| 2021.09.23 | 20:30 | €7,000 E80 UOS Rebuy Mid | 80 | 7000 | Holdem | 25 |
| 2021.09.23 | 20:30 | €3,000 E81 UOS Rebuy Low | 81 | 3000 | Holdem | 10 |
| 2021.09.23 | 20:30 | €100 E82 UOS Rebuy Nano | 82 | 100 | Holdem | 0.25 |
| 2021.09.24 | 19:00 | €10,000 E83 UOS Unibet Opener Bounty Re-enter High | 83 | 10000 | Holdem Bounty | 100 |
| 2021.09.24 | 19:00 | €7,000 E84 UOS Bounty Re-enter Mid | 84 | 7000 | Holdem Bounty | 25 |
| 2021.09.24 | 19:00 | €1,500 E85 UOS Bounty Re-enter Low | 85 | 1500 | Holdem Bounty | 5 |
| 2021.09.24 | 19:00 | €100 E86 UOS Bounty Re-enter Nano | 86 | 100 | Holdem Bounty | 0.5 |
| 2021.09.24 | 20:30 | €3,000 E87 UOS Mid | 87 | 3000 | Holdem | 50 |
| 2021.09.24 | 20:30 | €1,000 E88 UOS Low | 88 | 1000 | Holdem | 5 |
| 2021.09.24 | 20:30 | €100 E89 UOS Nano | 89 | 100 | Holdem | 0.5 |
| 2021.09.25 | 19:00 | €12,500 E90 UOS Unibet Open Rebuy Warm-Up High | 90 | 12500 | Holdem | 100 |
| 2021.09.25 | 19:00 | €6,000 E91 UOS Rebuy Mid | 91 | 6000 | Holdem | 25 |
| 2021.09.25 | 19:00 | €4,000 E92 UOS Rebuy Low | 92 | 4000 | Holdem | 10 |
| 2021.09.25 | 19:00 | €100 E93 UOS Rebuy Nano | 93 | 100 | Holdem | 0.25 |
| 2021.09.25 | 20:30 | €3,000 E94 UOS Sirius Banzai Bounty Mid | 94 | 3000 | Holdem Bounty | 25 |
| 2021.09.25 | 20:30 | €1,500 E95 UOS Sirius Banzai Bounty Low | 95 | 1500 | Holdem Bounty | 10 |
| 2021.09.25 | 20:30 | €150 E96 UOS Sirius Banzai Bounty Nano | 96 | 150 | Holdem Bounty | 0.5 |
| 2021.09.26 | 19:00 | €200,000 E97 UOS Unibet Open Online High 2-Days | 97 | 200000 | Holdem | 1100 |
| 2021.09.26 | 19:00 | €50,000 E98 UOS Unibet Open Rebuy High 2-Days | 98 | 50000 | Holdem | 100 |
| 2021.09.26 | 19:00 | €12,500 E99 UOS Rebuy Mid 2-Days | 99 | 12500 | Holdem | 25 |
| 2021.09.26 | 19:00 | €3,000 E100 UOS Rebuy Low 2-Days | 100 | 3000 | Holdem | 5 |
| 2021.09.26 | 19:00 | €750 E101 UOS Rebuy Nano 2-Days | 101 | 750 | Holdem | 1 |
| 2021.09.26 | 20:30 | €10,000 E102 UOS Rebuy High | 102 | 10000 | Holdem | 100 |
| 2021.09.26 | 20:30 | €5,000 E103 UOS Rebuy Mid | 103 | 5000 | Holdem | 25 |
| 2021.09.26 | 20:30 | €1,000 E104 UOS Rebuy Low | 104 | 1000 | Holdem | 5 |
| 2021.09.26 | 20:30 | €100 E105 UOS Rebuy Nano | 105 | 150 | Holdem | 0.5 |
