I dont think anyone can top Kareem he effectively won 4 titles, he was the best player as a freshmen which Freshman were ineligible. I hated Laettner but no denying how clutch he was, went to 4 final fours, he hit buzzer beating shots in the elite 8 twice, his team was down by 1 on both those shots btw.
Im a bit of a homer but for a single year from start to finish ill say Kemba Walker in 2010-11, winning 5 big east tournament games in a row then running the table in the NCAA tournament. Never coming out any games for a breather (hardly ever). Doing it with Freshmen who weren't Mcdonalds all americans, granted 2 of those Freshmen were Jeremy Lamb and Shabazz Napier. No way does Shabazz pull of his Championship run in 2013-14, if hes not a part of the 2011 team, he was essentially the HC on that team with Calhoun gone, as we found out Kevin Ollie couldn't win with his own recruits.