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 as a preferred sourceSports Illustrated's Michael Rosenberg on why he thinks this should be Michael Phelps last Olympics after he winning his 28th medal.Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Aug 13, 2016 | Modified Aug 13, 2016SI STAFFShare on FacebookShare on XHome/Olympics