It was a pretty pointless move, but it was awesome, too.
It appears Serena made good on Wozniacki's post-match request for drinks.
Nishikori is the first Asian male to reach a Grand Slam final.
Wozniacki is still in search of her first career Grand Slam title.
Roger Federer saved two match points while coming all the way back from a two-set deficit to beat Gael Monfils 4-6, 3-6, 6-4, 7-5, 6-2 Thursday night and reach the U.S. Open semifinals for the first time since 2011.
Marin Cilic defeated Tomas Berdych in straight sets in the quarterfinals on Thursday to reach his first-ever semifinals at the US Open.
After a bad-as-can-be start, dropping the first three games, Serena Williams quickly turned things around and stretched her U.S. Open winning streak to 19 matches to get back to the semifinals.
Kei Nishikori became the first Japanese man to reach the US Open semifinal since 1918 by outlasting Stan Wawrinka in five sets on Wednesday.
Aside from a brief first-set blip, Roger Federer was rather dominant in a 6-4, 6-3, 6-2 victory against 17th-seeded Roberto Bautista Agut of Spain that put the five-time champion in the U.S. Open quarterfinals for the 10th time in 11 years.
A busy day at the US Open as Gael Monfils advances to the quarterfinals, while the Williams sisters are out in doubles.