Ivo Karlovic lost a set to Britain's Jamie Baker, but pulled through

Scottish qualifier Baker, 21, broke the giant Croatian twice but Karlovic showed his quality at crucial times.

Baker said: "I was a bit disappointed by the way I started, I played a bit cagey, but I don't think the deficit of 200 ranking positions showed that much.

"I've kept the number 20 in the world on court for three-and-a-half hours."

Ranked 217th in the world and the British number three, Baker could take plenty of credit from his performance against Karlovic.

After Karlovic broke in the 10th game of the first set to win it, the two players exchanged breaks at the start of the second before Karlovic again won 6-4.

Baker saved two match points in the third, broke Karlovic again, and won the tie-break impressively.

There's no reason why I can't make the top 100... I'm a fast learner Jamie Baker

But Karlovic showed no further favours and efficiently won the fourth set to seal the match.

Baker added: "It's kind of difficult when you are playing against someone with as big a serve as that because you know your service games are so important.

"Every time I got into a rally I had to take chances to win points.

"But I want to get into these tournaments where I can challenge the world's best players and to get a bit more money in my pocket.

"Once you get into the top 100 you unlock the door a bit and it's a little easier to stay within those rankings.

"I've beaten three or four top-100 players and am troubling that guy today so there's no reason why I can't do that.