Former Top 10 player Fernando Verdasco and up-and-coming American Jack Sock are the latest players to join the singles field for the 2013 Winston-Salem Open.

A Spaniard who peaked at No. 7 in the ATP World Tour rankings in his career, Verdasco joins American Mardy Fish as two recipients of the tournament's four wild cards this week. Sock earned direct acceptance into the main draw after the withdrawal of Santiago Giraldo, who was ahead of him on the entry list.

Verdasco had two separate stints in the Top 10, in 2009 and 2010. He is currently is ranked No. 31 but is in the middle of a solid summer, with a trip to the quarterfinals at Wimbledon and a trip to the finals at Bastad in the last two months. He lost to eventual champion Andy Murray in five sets at Wimbledon.

Verdasco owns five career ATP World Tour singles titles and has been to the finals of 13 others. He also has won five doubles crowns in his career, including four last year with David Marrero. Verdasco and Marrero are entered into the doubles draw at this year’s Winston-Salem Open.

At age 20, Sock is one of the rising young Americans on the ATP World Tour. He had a phenomenal junior career, winning 18 USTA national titles including the 2010 USTA Boys' 18s National Championships and the 2010 US Open junior title. Sock currently is ranked No. 87 and was as high as No. 84 last month, after he won a Challenger event in Winnetka, Ill.

Sock's biggest victory of the year came when he beat current No. 10 Milos Raonic to reach the quarterfinals in Memphis. He also had a great run at Roland Garros, winning three qualifying matches and then advancing to the second round before he fell to Tommy Haas.

Sock also teamed with James Blake to win the doubles crown at Delray Beach earlier this year. The Nebraska native won two matches in qualifying at last year’s Winston-Salem Open but lost in the third round and failed to make the main draw. 

He competed at Cincinnati this week as a wild card but lost his opening match in three sets to Raonic.