Querrey Previews Sock vs Dimitrov SF Battle Nitto ATP Finals 2017 Nov 18, 2017 American Sam Querrey previews Saturday evening's semi-final clash between unbeaten Grigor Dimitrov and Jack Sock. Tags: 2017 Grigor Dimitrov Jack Sock Nitto ATP Finals Share 0 Share on Facebook Tweet Tweet on Twitter +1 +1 on Google Plus