Austin Mahone Sony Open with Serena Williams in Miami, FL

Austin Mahone poses with professional tennis player Serena Williams at the 2013 Sony Open Tennis Tournament on Tuesday afternoon in Miami, Florida.

Austin Mahone watched as Serena won over Na Li in the quarterfinals.

“Chillin with the 1 and ONLY @SerenaWilliams ,” he tweeted.

The week before, Austin went to see Spring Breakers with his friends Cody Simpson, Alli Simpson, and Madison Pettis in Los Angeles.