ACE. Better than an ace, as performance art, is the perfectly executed lob.
FAULT. People who had tickets to last night's session might reasonably have assumed, days ago, that they would witness the first-ever Rafael Nadal-Roger Federer duel in the U.S. Open. Federer's loss to Tommy Robredo Monday night scuttled that.
ACE. Tornado Black of Boca Raton, Fla., played up a storm in her second-round juniors match, knocking out No. 4 seed Barbora Krejcikova of the Czech Republic in straight sets.
FAULT. Overall, technology has done great things for tennis, but the electronic sensor in the net that signals a let-cord often has been criticized as too sensitive. Bring back the live person, always called Fingers Fortescue by tennis historian Bud Collins, who would rest a knowledgeable hand on the net.
numbers10 Seeding of the only U.S. girl seeded in juniors play, Louisa Chirico of upstate Harrison. She's still alive, playing a third-round match today.
28.38 Average age of the Open women's quarterfinalists -- Li Na, Flavia Pennetta and Serena Williams each is 31 -- significantly higher than the 22.75 of 20 years ago.
86/83 The number of European entries in the men's/women's Open singles fields, each totaling 128 players. That's more than 65 percent in both cases.
Noah Rubin of Rockville Centre was defeated in his second-round juniors match yesterday by No. 2 seed Gianluigi Quinzi of Italy, 6-3, 6-4. Rubin, 17, also was eliminated (with partner Clement Geens of Belgium) in junior doubles yesterday.