Cincinnati, OH, USA, 18 August 2016 | AAP/tennis.com.au

Bernard Tomic has claimed his highest ranked scalp in seven months, beating World No.11 David Goffin to advance to the third round of the Cincinnati Masters.

Tomic had to stage a fightback, dropping a set to the German before rebounding to win 3-6 7-5 6-4 in almost two hours.

It marks the first time the Australian has beaten a player inside the top 12 since Kei Nishikori at the Brisbane International in January.

He will now have to repeat the feat. The Japanese world No.7 will be his next opponent after beating Russian Mikhail Youzhny 6-3 6-2.

Tomic will aim to keep his serve on song for the contest; against Goffin he managed to send down 16 aces and landed 65 per cent of first serves to set up the win.

It was a much needed victory with less than two weeks till the US Open and given he was bundled out in his first match at the Los Cabos Open in Mexico.

In other Aussie results, John Millman went down to Dominic Thiem.

Millman, a qualifier, fought hard but found the Austrian No.8 seed ultimately too tough; Thiem posted a 7-5 6-1 victory to advance to the third round.

Later on Wednesday, Nick Kyrgios went down in a thriller against Borna Coric.

The Croat beat the No.14 seed 7-6(2) 4-6 7-6(6) in two-and-a-half hours.

Coric broke late in the third set and served for the match at 5-3, only for Kyrgios to break back to love.

The final set progressed to a tiebreak, during which Kyrgios led 5-2 and held a match point at 6-5.

Yet Coric reeled off three straight points, sealing victory when Kyrgios misfired long with a forehand.

Coric will face Rafael Nadal in the last 16.