Good afternoon and welcome to LIVE coverage of Roger Federer against Grega Zemlja in the last 16 of the Qater Open in Doha.

GAME, SET AND MATCH FEDERER! The Swiss player wins 12 out of the last 14 points to reach the last eight. Impressive stuff from Federer, who extends his undefeated record to 19 matches. He is through to the last eight.

BREAK FEDERER! Zemlja finally wilts at the key moment as Federer breaks for the first time in this set. On the cusp of a 19th straight victory as he prepares to serve for the match.

A slight window of opportunity for Zemlja as he manages to nudge the score to 30-30 only for Federer to come up with a winning backhand volley to move to advantage. He wins the next point with some ease for a 4-3 lead. Pressure again on Zemlja to respond.

Zemlja continues to stay with Federer in this set, which is easier said than done. Federer yet to find a break point in this set with his unfancied opponent looking markedly better than 116 in the world. We remain on serve at 3-3.

Federer drops a solitary point in moving ahead by the odd game in five. Federer producing some magnificent depth to back his opponent up deep in the court. Federer certainly close to his best at times in this match.

Zemlja again living on the edge in trailing 0-30 before coming up with the goods to restore parity in this set at 2-2. Both men racing through this set at the moment. Zemlja certainly not lacking any pace on his serve. We remain on serve.

Not exactly a full house in for this match and looks to be a bit chilly as Federer wraps himself in a towel, but the absent locals are missing some vintage Federer, who is not lacking any of his trademark timing in the opening tournament of the year. Another comfortable hold by Federer for a 2-1 lead.

12 winners from Federer, but 11 from Zemlja who recovers from trailing 30-0 to win four straight points to level at 1-1. Looked to be all in sorts of bother, but started to drill some fine winners beyond Federer. Must stay with Federer for as long as possible in this second set.

Federer gets the second set off and running with a love game. All too easy for the Swiss player, who looks in a hurry to get the job done as soon as possible out there. Zemlja must surely hold in this game to keep alive realistic hopes in this second set.

SET FEDERER! Zemlja saves one set point. Using the sliced backhand to some effect as he saves the second set point. Federer fading the backhand before a gorgeous winner drops just over the net to hand the Swiss master a third set point. A crunching backhand winner across court sees Federer wrap up the first set in 31 minutes for a 1-0 lead. 11 winners from Federer in that set compared to eight from Zemlja.

An excellent return of serve by Zemlja is good enough to bring up a second break point, but a couple of sluggish shots lets Federer off the hook as the ball limps into the net. A rampant backhand winner by Federer down the line carries him to advantage before a big first serve is good enough to ward off the danger. Federer one game away from the opening set.

Zemlja with three aces in comparison to Federer's one. A better service game from the Slovenian player, but he will need to find some magic on the Federer serve if he is going to recover this situation. A 4-2 lead for Federer with the break.

Federer comes to the net to send a crunching drive volley beyond Zemlja as he cements the break for a 4-1 advantage. Federer - with his base in Dubai - is used to these conditions in the Gulf at this time of the year, and is looking as impressive as Nadal did earlier. Moving with some purpose as Zemlja comes out to serve 1-4 down.

BREAK TO FEDERER! Federer hardly looks like he is breaking sweat out there. Too much class in that game as the direction of his groundstrokes leaves Zemlja firmly on the back foot. Early days, but already dangerous times for the Slovenian player in this match with Federer a break to the good.

Federer yet to come across his Slovenian opponent on the professional tour, but his game seems to be matching up quite well to Zemlja's in these opening moments. Hitting the ball with some purpose to move 2-1 clear.

A fine effort from Zemlja in his opening service effort as two aces help him to restore parity at 1-1. Impressive serving by the unfancied Slovenian player, who is ranked at a lowly 116th in the world.

A 1-0 lead for Federer aided by a love game. Can't do better than that in the opening game of the match. Zemlja looking to do likewise in his first service game. Federer serving with some confidence straight away.

Federer to serve in the opening game of the match.