Here are some of the top ATP players and their first ever ATP title triumph.
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Novak Djokovic beat Dominic Thiem's current coach Nicolas Massu in the finals of Dutch Open 2006.
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Federer recently celebrated the 20th anniversary of his first ATP title victory at Milan Open 2001.
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Kei Nishikori won his first title at Delray Beach Open in 2008.
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Dominic Thiem won his first title at Nice Open in 2015.
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Rafael Nadal won his first title in Sopot Open in Poland back in 2004.
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Alexander Zverev won his first ATP title after beating Stan Wawrinka in the 2016 St.Petersburg Final.
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