Roger Federer was among a host of tennis stars who expressed their amazement as Nicolas Mahut and John Isner played the longest match in the history of the sport at Wimbledon on Wednesday.

A string of tennis records were blown away as French qualifier Mahut and American 23rd seed Isner came off court at 59-59 in the final set, having slugged it out for exactly 10 hours when play was suspended as they ran out of daylight.