Lincoln native Jack Sock faced two match points, but came back to beat No. 15 Daniel Kosakowski of Downey, CA in five sets, in the quarterfinals of the USTA Boys 18s National Tennis Championships at Kalamazoo, MI on Thursday. Third-seeded Sock advances to the semifinals on Friday against top-seeded Jordan Cox of Bradenton, FL.
Last month Sock lost to Cox in two sets 3 and 3 in the first round of a Pro Futures tournament. Sock and his doubles partner beat Cox and his doubles partner in this event in Kalamazoo.
Also at this venue is the USTA Boys 16s where Omaha Creighton Prep junior and sixth-seeded Anthony Del Core lost to No. 1 seed Shane Vinsant of Keller, TX 4 and 4 in the quarterfinals.