ACE: Francesca Schiavone's I-could-use-a-hug moment as she was getting pounded by Serena Williams on Monday night. Schiavone embraced the handiest ball boy but said afterward, "I didn't need a hug at that moment. I needed a game. Points."
FAULT: A roof over Arthur Ashe and Louis Armstrong Stadiums will have one slight drawback, taking away the open view to the Manhattan skyline.
ACE: A video board now displays the times and practice courts of the star players for fans who like to watch workouts.
FAULT: Late, late matches. Federer doesn't begin play until . . .
By the numbers . . .
5 Different Open men's champions in the last five years: Federer, del Potro, Nadal, Djokovic, Murray.
28-0 Canadian Milos Raonic's ace totals vs. Italy's Thomas Fabbiano in a straight-sets victory.
100 The number of years of weather patterns studied by the U.S. Tennis Association before it built Arthur Ashe Stadium (opened in 1997). Because of the study, the USTA decided then that a roof wasn't necessary.
Sachia Vickery of Hollywood, Fla., who earned a wild-card berth in the Open's main draw by virtue of winning this year's 18-and-under national championship, won her first-round match over former U.S. Open junior champion Mirjana Lucic-Baroni, now a 31-year-old veteran from Croatia, 6-4, 6-4.