CoCo Vandeweghe
Age: 26
Ranking: No. 16 in singles/No. 42 in doubles
Fed Cup Record: 8-3 in singles/5-0 in doubles
2018 to date: Vandeweghe hasn’t been able to replicate her hot start to 2017 in singles, but in doubles, the American won the Miami Open with Ashleigh Barty, as they played dominant tennis throughout the tournament.
Season Highlight: Miami Open doubles champion.
Bethanie Mattek-Sands
Age: 33
Ranking: No. 201 in singles/No. 32 in doubles
Fed Cup Record: 2-6 in singles/7-0 in doubles
2018 to date: The former world No. 1 in doubles is back after suffering a horrific knee injury last year at Wimbledon. This will be her third event this year.
Season Highlight: Doubles quarterfinals in Charleston.
Kristina Mladenovic
Age: 24
Ranking: No. 20 in singles/No. 14 in doubles
2018 to date: Reuniting with Timea Babos, the duo won the Australian Open this year. That win gave Mladenovic a much-needed boost of confidence as she was in the midst of a double-digit losing streak in singles. She went on to reach the final in St. Petersburg, where she was the defending champion.
Fed Cup Record: 8-6 in singles/10-2 in doubles
Season Highlight: Australian Open doubles champion