Querrey, Sock lose in first round of Delray Beach Open

Adrian Mannarino beat Jack Sock to move into the second round of the Delray Beach Open.

William West/Getty Images

The top four seeds in the singles draw will be in action for a full slate of matches Tuesday. Haas and No. 4 seed Kevin Anderson each have early matches. The evening schedule included No. 3 seed Kei Nishikori, who returns to the site where he captured his first title. The final match of the day will be an all-American pairing between No. 2 seed John Isner and Michael Russell.