Federer suggests tiebreaks at 12-12 to decide marathon matches

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 4/7/16 Switzerland's Roger Federer celebrates winning his match against USA's Steve Johnson REUTERS/Andrew Couldridge

LONDON (Reuters) - Roger Federer thinks a tiebreaker at 12-12 would be the best compromise following calls for Wimbledon to step into line with the U.S. Open and scrap long deciding sets.

American John Isner, winner of the longest match in tennis history but loser in a 19-17 fifth-set marathon against Jo-Wilfried Tsonga on Sunday, believes Wimbledon should enforce a tiebreak if the deciding set reaches 6-6.