Having nurtured his son's tennis progression, Sunday was a particularly poignant moment for Alexander Zverev Sr. as he watched the 21-year-old prodigy topple Novak Djokovic in straight sets and win the ATP World Tour Finals the day after ousting Roger Federer in the semifinals in London.
"There were a lot of emotions hugging him. He had a lot of emotions as well," Zverev told CNN Sport's Christina Macfarlane after Sunday's victory.
"He's basically been coaching me for 21 years ... I can't thank him enough."
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