Holger Rune of Denmark toppled No. 8 seed Zizou Bergs of Belgium 6-3, 6-4 in the first round of the Bybit Stockholm Open on Tuesday in Sweden.
Rune, 23, ruptured...
Jiri Lehecka, two matches into his return from a back injury, is already showing top form.
The Czech player upset fourth-seeded Daniil Medvedev of Russia...