Saint Petersburg ATP results on Monday: Men's singles 1st round Aslan Karatsev (RUS) bt Tennys Sandgren (USA) 7-5, 3-6, 7-5 Alexander Bublik (KAZ) bt Mackenzie McDonald (USA) 2-6, 7-6 (7/2), 6-4 Cameron Norrie (GBR) bt Taylor Fritz (USA x8) 6-4, 4-6, 6-3 Evgeny Donskoy (RUS) bt Egor Gerasimov (BLR) 6-4, 7-6 (7/4) afp