#3 Grigor Dimitrov
Grigor Dimitrov also had his career-best year in 2017. The current World No. 3 won four titles last year including his first Masters 1000 title at Cincinnati and the ATP Finals. He also reached the finals of the Stockholm Open.
He has reached the semi-finals of Wimbledon 2014 and the 2017 Australian Open along with a quarter-final showing at the 2014 Australian Open. He stretched Nadal to five sets at the Australian Open last year and is slated to meet Nadal again in the semi-finals this year.
As the defending champion at the Brisbane International 2017-18, he lost in the semi-finals to eventual champion, Kyrgios.
Dimitrov has an all-court game and is comfortable at the net as well as the baseline. The most successful Bulgarian male tennis player is nicknamed as "Baby Fed" for his similar style of play to Roger Federer. He has been called as one most talented up-and-coming players for the last few of years and at now at the age of 26 will be looking to authenticate that.