Michael Phelps, 28 medals should be enoughSports Illustrated's Michael Rosenberg on why he thinks this should be Michael Phelps last Olympics after he winning his 28th medal.SI Staff|Share on FacebookShare on XAdd us on Sports Illustrated's Michael Rosenberg on why he thinks this should be Michael Phelps last Olympics after he winning his 28th medal.Published Aug 13, 2016 | Modified Aug 13, 2016SI STAFFShare on FacebookShare on XHome/Olympics