Sean "Day" Plott is Nick "Tasteless" Plott's younger brother and a high-level American Zerg player, rated A/A+ on ICCUP/PGT throughout multiple seasons and accounts. His main tournament spotlight has been his invitation to represent the United States at the WCG Grand Final three times and winning WCG Pan-American Championship. He currently hosts the program Day TV on Day9.tv that analyzes recent professional StarCraft matches. Day also casted for hundreds of TeamLiquiders at Blizzcon 2009, providing refreshing analysis and live commentary of the OSL Finals between Jaedong and YellOw[ArnC]. Day is known for his deep strategic analysis.
- Has made an autobiographic video covering his earlier StarCraft experiences. 
Day9 is famous for his series of videos called Day(9) Daily where he analyzed Korean pro-level games, as well as showed tutorials. Day(9) casted two of the largest foreign Broodwar tournaments - 2008 Razer TSL and 2009 Pokerstrategy.com TSL. After the release of Starcraft:Remastered, Day9 has co-casted a few of the biggest foreign Broodwar tournaments, for example, ZOTAC CUP Masters SCRM and Twitch Starcraft Holiday Bash.
- Has been known to be a frequent poster in the Teamliquid strategy forum. Has also done quite a lot of commentating for live events, his own FPVOD's and has a frequently updated strategy podcast on TeamLiquid.net, as well as an (almost) daily show.
- Is the brother of the famous commentator and community profile Tasteless, whom he took out early in the WCG GF 2005 when Tasteless started commentating.
- Has played in almost all WCG USA preliminaries since 2001.
- Played in the Collegiate Star League, representing USC. As his career as a progamer tapered off, he became a manager for the USC division of the CSL.
- Cast the infamous Chill Vs Combat-ex Grudge Match.
|In Major Tournaments|
|2004-09-20||2nd||WCG USA 2004||1 : 2||Froz|
|Complete Results in any Tournament|
|WCG Pan-American Champion|
|WCG Pan-American Championship 2006
|WCG Pan-American Championship 2007
22.06.2007 - 24.06.2007
|WCG Pan-American Championship 2008|
- Day9 Starcraft 2 Interview - By AndroidBit
- Sean Plott, Star-Crafter-extraordinaire - Radio Interview by Brian Hildebrand
- 2005 Grand Final - Sean Plott vs Sherwin Mahbod Match 1
- 2005 Grand Final - Sean Plott vs Sherwin Mahbod Match 2
- 2005 Grand Final - Sean Plott vs Sherwin Mahbod Match 3