Swiss Stan Wawrinka commented on his victory over Russian Karen Khachanov in Doha. “We played at the highest level. I did a great job in the offseason and knew that it would bring results. In terms of physical fitness and play, I feel great. In the first match I came across a strong contender who won Masters last year in Paris. I am pleased with what I showed on the court. This is a new match and a new season. Last year I beat Karen in St. Petersburg, but after that he won the title. One feels that now he is more confident in himself and also added to the game plan. Previous experience was important to me to determine the tactics for this match, ”the ATP press service quotes Wawrinka.