ATP Finals: Spirited Zverev on course with gritty win

Alexander Zverev got on the scoreboard of the Nitto ATP Finals with a gritty win over the battling Argentine Diego Schwartzman, finally giving himself a shot at making the last four at the O2 in London. The towering German, who came through 6-3, 4-6, 6-3 in 2 hours and 12 minutes, celebrated with a fist pump.