Nick Kyrgios continues to play for Fayez Sarofim & Co. U.S. Men’s Clay Court Championship as if his last clay court event before this week hadn’t been three years ago. His adaptation to this surface already has him in the quarterfinals thanks to his two wins this week in Houston.On Tuesday it was against Mackenzie McDonald, and on Wednesday against another American, seventh-seeded Tommy Paul. The No. 94 in the ATP Rankings needed just one hour and 10 minutes to prevail with runs of 6-4, 6-2 to bring his ATP HeadToHead record to 1-0 with Paul.Invited by the organization to play this main dr …