In clay-court tennis, where the ball leaves a clear mark on the surface, players can challenge line judges' calls by pointing to the spot where they believe the ball bounced; at Wimbledon, officials will refer to a screen showing a Hawkeye graphic if a player challenges a call.
It was to be hoped the sight of seats being thrown on to the pitch, invasions of the playing surface, players running for the cover of the tunnel and police drawing batons on fans had been consigned to the past - sadly this was not the case here and did a disservice to a big FA Cup occasion and another big win for Villa and Sherwood.
Many experts, including McEnroe, have called him the best hard-surface player in history.
But the Argentine wild card is David Nalbandian, their longtime leader and a terrific all-surface player whose career has been derailed by injuries.
Having not expected to do well on her least favourite surface, the player told her parents not to watch her play in London.
These include the requirement of repeated maximal level exertions during points with average durations ranging between 2 and >8 s depending on the match surface and player's gender. 1 2 Match durations of greater than 5 h can be encountered.
There have been numerous complaints about the playing surface from players all week, citing bad contacts and balls rolling off.
Grass is a foreign surface to players like Kudla and Sock, who have grown up being drilled on hard courts.
Roy Hodgson will conduct his final audition for England's Got Talent on Monday tonight, in an arena that would not look out of place in the Vanarama National League, on a surface that players will fear as much as trust.
Plans have slowed to build an open-air ballpark, which would improve the playing surface — "No players should have to play on turf," Crawford said — but not necessarily increase interest.
"Having to look at the impact of this kind of surface on players' recoveries and certain joints and certain muscles, and to put procedures in place to make sure you've got ample time to recover, is something that every team has to deal with.
