Björn Borg's son, Leo, joins Nadal Academy.
New York Empire score second straight win.
Former Wimbledon winner says he's "free at last" from virus.
Hall of Famer leads New York Empire past Philadelphia Freedoms.
World No. 8 says US Open decision coming soon.
World No. 3 has mixed emotions on Flushing Meadows
Roger Federer's hometown tournament won't be played this year.
