For Day's Streamed Starcraft Show, see Day Daily.
Sean "Day" Plott, brother of Nicolas "Tasteless" Plott, is a well-known StarCraft: Brood War and StarCraft II player and commentator. Day is the host of the popular Day9 Daily show, where he casts and analyzes high level play. With the release of StarCraft II, Day has become the face of StarCraft in the growing e-Sports community, as well as a focal point for StarCraft casting and commentating. In StarCraft II, Day plays Random (previously Zerg in Brood War). Day formerly co-hosted State of the Game with JP "itmeJP" McDaniel, Tyler "NonY" Wasieleski, Geoff 'iNcontroL Robinson and Dan "Artosis" Stemkoski.
Day received an undergraduate degree in Mathematics from Harvey Mudd College. On May 11, 2011, he obtained a Masters degree in Interactive Media from USC.
On May 31, 2011, while co-hosting an episode of State of the Game, Day announced that he planned to begin streaming himself playing games once he stopped being "embarrassingly terrible". 
During the beta Day did not participate in many tournaments. He was invited to the HDH Invitational where he lost to Tasteless in the first round. Day has also played in the TeamLiquid SC2 Invitational 2 where he lost to Artosis in the first round. Sean has instead focused on his commentating in tournaments like the TLI 1 and ZOTAC Cup.
He has also been in several podcasts, such as his own podcast on TeamLiquid and MLG's podcast series, where he discusses the game with other players.
Wings of Liberty
As of August 24, 2010, Day was ranked 18th in his division in Platinum League, with a record of 17-4. This was not his main laddering account however, which he tried to keep low profile in order to keep himself from being recognized on ladder. In Season 2 of Wings of Liberty, the Day account had not played any matches in 1v1. However, in 2v2, Day was ranked in Master league. It is mentioned on several episodes of the Daily that Day did not actually possess an account on which he played Random, as was widely believed, but rather 3 smurf accounts, one for each race. He would physically roll a die to see which race he would play. At some point, he had stated that all three of his accounts were in Grandmaster League. However, upon being challenged on this point, he never provided any evidence of this, and it is now widely believed[by whom?] he is at a high masters level.
Notable Events Cast
|2010||PC Gamer UK's Gamer Of The Year|
- vs. Tasteless Game 1 (Part 1) (Part 2) (Part 3)
- vs. Tasteless Game 2 (Part 1) (Part 2)
- vs. Tasteless Game 3 (Part 1) (Part 2)
- 2014-06-19 | Day9 on his life now, game development, and casting MLG - Part 1 and Part 2 by Hot_Bid of TeamLiquid.net
- 2013-06-24 | How Going to an eSports Event in Korea will Turn (Nearly) Anyone into a Fan by Green Tea Graffiti at WCS Season 1 Finals
- 2011-06-17 | "An understanding of the game benefits users greatly" - Interview with Day by pcgamer.com
- 2011-06-08 | "Day on being promoted to 'Masters League'" by Chargelot
- 2011-05-04 | "Keeping track of the game requires a ton of games played" by Blizzard Entertainment
- 2010-06-17 | "The Hardest Work Man in eSports" by PolygonRevue
- 2010-05-08 | "I hope my brother beats White-Ra in the HDH" by Kennigit of TeamLiquid.net
- TeamLiquid Beta Podcast #5
- TeamLiquid Beta Podcast #4
- TeamLiquid Beta Podcast #3
- TeamLiquid Beta Podcast #2
- TeamLiquid Beta Podcast #1
- State of the Game
- Day9 Cracks Him Self Up
- Day9 on Forbes 30 Under 30 Entertainment List
- Player Profile: Sean "Day[9" Plott] Wizards of the Coast