When Eddy Merckx won a then-unprecedented fourth consecutive Tour de France in 1972, he said enough was enough.
http://us.rd.yahoo.com/dailynews/rss/search/tour+de+france/SIG=11qv1q74i/*http%3A//www.chron.com/cs/CDA/rssstory.mpl/front/3034847
http://us.rd.yahoo.com/dailynews/rss/search/tour+de+france/SIG=11qv1q74i/*http%3A//www.chron.com/cs/CDA/rssstory.mpl/front/3034847