watched Sevastova (number 18) - Stephens (last years US Open champ) yesterday, was some master psychological battle from the underdog Latvian. start of first set looked like Stephens will dominate, in 3rd game she got 7 break chances, but Sevastova survived them all, won the 3rd game and Stephens pretty much lost it at that moment, going out with 62, 63. wondering if Sevastova will be able to take down Serena in the semis, she got the playing style suited for battling Williams, but Serena is mentally very strong and won't crumble like Stephens yesterday