Former President Barack Obama and his wife, Michelle, were in the Arthur Ashe Stadium stands to watch Coco Gauff’s first-round victory at the U.S. Open on Monday night. Afterward, Gauff met the Obamas — and even received some advice. Michelle Obama also went to the court Monday night to participate in a tribute to Billie Jean King marking the 50th anniversary of the U.S. Open becoming the first Grand Slam tennis tournament to pay equal prize money to women.