|Irish name||Brian Ó Súilleabháin|
|Born||1990 (age 26–27)
O'Sullivan has played with Ballygunner since an early age.
O'Sullivan started playing inter-county hurling with Waterford at the age of 18. O'Sullivan first broke into the team during the 2011 National Hurling League. O'Sullivan made his championship debut on 12 June 2011 against Limerick GAA in the Munster Championship Semi-final at Semple Stadium, Thurles. O'Sullivan scored 2 points from play.
|1||12 Jun 2011||Semple Stadium, Thurles||Limerick||0-2||3-16 : 3-15||Munster Semi-final||RTE Sport|
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