Seeds Kei Nishikori and Grigor Dimitrov advanced to the quarterfinals of the Brisbane International 2015 after overcoming their respective counterparts in the second round of the tournament.

Whilst second-seeded Nishikori had no troubles toppling American Steve Johnson 6-4, 7-5, fourth seed Dimitrov saved two match-points en route his nervy 3-6, 6-4, 7-6 triumph.

“I have more confidence and I beat a lot of Top 10 guys (in the past) two, three years,” Nishikori was quoted as saying by the ATP World Tour.

He continued: “If I can play good tennis all the time, I think I have a lot of chance to go top level. Hopefully this is going to be a good start.”

SECOND ROUND RESULTS – SINGLES

(4) G Dimitrov d. J Chardy (3-6, 6-4, 7-6)

M Klizan d. (7) A Dolgopolov (1-6, 7-6, 7-6)

B Tomic d. (W) T Kokkinakis (7-6, 6-1)

(2) K Nishikori d. Steve Johnson (6-4, 7-5)

QUARTERFINAL RESULTS – DOUBLES

S Johnson/S Querrey d. (4) E Butorac/S Groth (3-6, 7-5, 10-6)

A Dolgopolov/K Nishikori d. C Guccione/L Hewitt (6-2, 7-5)

(Image: brisbaneinternational.com.au)