Retired - Retired after 2019 season
- Birthdate: 12/03/1985
- Drafted (NBA): 22nd pick, 2006
- Pre-draft team: Connecticut
- Country: USA
- Hand: Left
- Agent: -
| Date | League | Transaction |
|---|---|---|
| 2006 NBA Draft | NBA | Drafted 22nd overall by New Jersey. |
| 11th July, 2006 | NBA | Signed four year, $5,617,445 rookie scale contract with New Jersey. Included team options for 2008/09 and 2009/10. |
| 29th October, 2007 | NBA | New Jersey exercised 2008/09 team option. |
| 22nd July, 2008 | NBA | Traded by New Jersey to Golden State in exchange for a protected 2011 first round pick (later modified via a separate trade to a protected 2012 first round pick, itself deferred to 2013; #21, Gorgui Dieng; a 2011 second round pick (#41, Darius Morris) was sent as incentive for the pick's modification). |
| 31st October, 2008 | NBA | Golden State declined 2009/10 team option. |
| 10th March, 2009 | NBA | Waived by Golden State. |
| 30th March, 2009 | Puerto Rico | Signed a one season contract with Piratas de Quebradillas. |
| 6th August, 2009 | NBA | Signed a partially guaranteed one year minimum salary contract with Memphis. |
| 10th August, 2010 | Russia | Signed a one year contract with Enisey. |
| 27th June, 2011 | Russia | Signed a one year contract with Unics Kazan. |
| 21st September, 2011 | Russia | Left Unics Kazan. |
| 2nd December, 2011 | China | Signed for the remainder of the season with Jiangsu. |
| 30th July, 2012 | Spain | Signed a two year contract with Unicaja Malaga. Included team option for 2013/14. |
| 14th June, 2013 | Spain | Unicaja Malaga declined 2013/14 team option. |
| 19th August, 2013 | Russia | Signed a two year contract with Lokomotiv Kuban. Included team option for 2014/15. |
| 2nd July, 2014 | Russia | Lokomotiv Kuban declined 2014/15 team option. |
| 13th August, 2014 | Serbia | Signed a two year contract with Crvena Zvezda. |
| 28th December, 2015 | Serbia | Left Crvena Zvezda. |
| 27th July, 2016 | Montenegro | Signed a one year contract with Buducnost. |
| 26th September, 2017 | NBA | Signed an unguaranteed one year minimum salary contract with Sacramento. |
| 10th October, 2017 | NBA | Waived by Sacramento. |
| 21st October, 2017 | D-League | Designated as an allocated player by Reno Bighorns. |
| 26th April, 2018 | Puerto Rico | Signed for the remainder of the season with Piratas de Quebradillas. |
| 22nd October, 2018 | G-League | Designated as a returning player by Stockton Kings (formerly Reno Bighorns). |
| 2003 - 2006 | Connecticut (NCAA) |
| June 2006 - July 2008 | New Jersey Nets (NBA) |
| July 2008 - March 2009 | Golden State Warriors (NBA) |
| March 2009 - July 2009 | Quebradillas (Puerto Rico) |
| July 2009 | Memphis Grizzlies (Summer League) |
| August 2009 - June 2010 | Memphis Grizzlies (NBA) |
| August 2010 - June 2011 | Enisey (Russia) |
| June 2011 - September 2011 | Unics Kazan (Russia) |
| December 2011 - June 2012 | Jiangsu (China) |
| July 2012 - June 2013 | Unicaja Malaga (Spain) |
| August 2013 - July 2014 | Lokomotiv Kuban (Russia) |
| August 2014 - December 2015 | Crvena Zvezda (Serbia) |
| July 2016 - June 2017 | Buducnost (Montenegro) |
| September 2017 - October 2017 | Sacramento Kings (NBA) |
| October 2017 - April 2018 | Reno Bighorns (G-League) |
| April 2018 - June 2018 | Quebradillas (Puerto Rico) |
| October 2018 - present | Stockton Kings (G-League) |
August 21, 2010
Marcus Williams signed with BC Enisey Krasnoyarsk in Russia.
July 30, 2010
Marcus Williams - Williams was Memphis's other backup point guard last year, alongside Tinsley. Like Tinsley, he had fallen out of the league due to weight problems and lacklustre play; like Tinsley, he was looking to the Grizzlies (who were willing to take more chances in a bid to strike gold) as a way back into the fold. And like Tinsley he wasn't very good either. Williams got back into the NBA because of how brilliantly he ran the Grizzlies full-court offense in summer league, but it didn't translate to the regular season, where his own lack of offense was again costly. Williams might still get other looks, and it would probably benefit him greatly to get them on teams with more disciplined offenses than Memphis. It's a talented team, but not a smart one.