Roger Federer has said that the addition of a roof to the Arthur Ashe Stadium at the US Open will favour the top players.
The structure is in place over the biggest court at Flushing Meadows for the first time in 2015, and will be a fully-functioning retractable roof by next year's tournament like that over Centre Court at Wimbledon.
The second seed, who is a five-time champion in New York, told reporters: "It has changed. Forever. I think it's going to increase the level of play from all players.
"If you don't have to fight the wind you can play closer to the lines and make it better tennis. So probably it might be better for the top guys, my opinion."