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