Alexander Zverev is seeded fourth this week at the ATP Masters 1000 in Paris, and he's got a secret weapon. The 20-year-old was joined during a practice session by his dog, Lovik.

Lovik became a star in Washington, where Zverev won the title and saluted his family dog in his victory speech. It wasn't his first appearance on tour as Lovik was present for the photo-ops when Zverev won Rome for his first ATP Masters 1000 title.

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Lovik may really be good luck. He was also in Montreal, where Zverev stunned Roger Federer for his second ATP Masters title.

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Zverev has already qualified for the ATP Finals in London, but the race for the final two spots is still on this week.