Both of the Zverev brothers, Mischa and Alexander, have had incredible 2017 seasons. The older sibling, Mischa, finally broke into the Top 30 in the world, reaching a career-high ranking of No. 25 back in late July. The 30-year-old also reached the final in Geneva.

However, it's his younger brother who has really lit up the tour. At only 20 years old, Alexander Zverev has broken into the Top 5, reaching No. 4 in the world in September. He also has won five titles this year so far, including his two ATP Masters wins, the first of his career, in Rome and Montreal.

Always try to give back with @mischazverevofficial @atpshenzhenopen @atpworldtour A post shared by Alexander Zverev (@alexzverev123) on Sep 27, 2017 at 12:01am PDT

ATP got together with the brothers, who spoke about how they are each others inspiration.

"[Alex] was always telling me 'You can do it, you can do it, you can still play well!' and now both of us are in the Top 30," Mischa Zverev said. "I think that's a great moment."

Alexander Zverev said traveling with his brother has helped the most:

"I think the practice sessions, the way we practice, the intensity, I think between two brothers we don't want to lose to each other in practice," he said. "So I think that's something very special."

Alexander Zverev is playing for his sixth title this year at the Shenzhen Open, and is the top seed. Mischa Zverev is in the same tournament as the No. 3 seed.