He is a former WTA Writer of the Year and the author of numerous books, including the classic "The Courts of Babylon" and the New York Times bestseller (with Pete Sampras), "A Champion's Mind".
What does being bounced out of the U.S. Open in the quarterfinal round mean now to Sloane Stephens?
Serving for the match, the Latvian raced out to triple match point and although Stephens saved two of them, Sevastova sealed the win when the 25-year-old American pushed a backhand into the net. But Stephens leaves Flushing neither crushed nor embarrassed.
'Just looking forward to playing and competing and hopefully keep playing well and keep it going. "I played some good ones before, but not that long, not that long against the great guys on the Grand Slam stage".
The US Open is not available to watch on TV for United Kingdom viewers.
"When you don't play big points well, the match can get away from you", she said. When you go to a tournament, it starts all over again.
Go back to 2015, and that was another semifinal departure for Williams, whose bid for a calendar-year Grand Slam was shockingly ended by Roberta Vinci.
It did take Williams a little while to get going as she pursues a seventh US Open title. "She handled it better".
He played back-to-back four-setters against Karen Khachanov and Nikoloz Basilashvili before recovering from breaks down in the third and fourth sets against Thiem. "But I know what you're talking about", Stephens said, then proceeded to give her own play-by-play.
"I have never seen Roger sweat ever". I made the most of it this week or the last, whatever, 10 days, whatever it was.
"I think it was very physical today", Sevastova, who lost to Stephens during a US Open tune-up in Montreal last month, said during her on-court interview.
Both players had two chances to break in the third set, and the 15-40 chance that Isner missed at 2-1 ultimately proved to be his big opportunity. She didn't even try for it.
"If we skip the first set, it was a really open match from beginning to the end".
Nadal, 32, is the only man to have reached the quarter-finals of all four Slams this year.
Sevastova herself relies on variety more than power, and she caught a slow-moving Stephens with a number of drop shots and drop-shot lob combinations.
But when she fell behind 0-40 in the seventh game she rescued herself with 112 miles per hour (180 km/h) service victor followed by another service victor and an ace. I am not happy about this, ' he said, managing a smile.
Sevastova's game plan worked.