John Isner has urged tennis authorities to resist revising the tournament calendar after Rafael Nadal’s knee injury became the latest problem to curtail the playing time of the Big Four.

The Spaniard withdrew from the Paris Masters on Friday, and Roger Federer, Novak Djokovic and Andy Murray — all missing from the tournament — have also been sidelined by injury during the season. Of the Big Four, only Federer seems certain to take his place at the ATP Finals in London later this month.

Paris semifinalist Isner would qualify for London if he went on to win what is the last Masters event of the year. He told ESPN, “The season is manageable. I know a lot of players talk about the season being too long, but I don’t think that.

Source: ESPN