Hello and welcome to our LIVE coverage of the first Madrid Masters semi-final as a resurgent Juan Martin Del Potro faces the in-form Tomas Berdych, start scheduled for 3.30pm local time, 2.30 BST.

Berdych finally brings up matchpoint on his own serve after an untimely error by Del Potro at 6-6. An overhead winner from Berdych is good enough to complete the win. 8-6 in the breaker. He completes a 7-6 7-6 win with Del Potro continuing to complain to the umpire about a couple of calls. Two hours and 18 minutes. It is all over.

6-6....Del Potro loses his footing at the back of the court as Berdych snaffles up the first mini-break of the breaker for a 3-1 lead. An ace from Del Potro sees him close to 3-2 behind. A big second serve flies past Del Potro for a 4-2 advantage. A double fault by Berdych sees Del Potro close to 4-3 behind. Del Potro comes up with the goods on serve for a 5-4 lead only for Berdych to make it 5-5. A big first serve carries Berdych to match point only for Del Potro to save it with an ace.

Del Potro buries his head into his hands after hitting the net holding a 30-15 lead before Berdych throws down a big ace to establish a 40-30 lead. Del Potro forces matters to deuce, but Berdych ekes out the game with a backhand winner down the line. 6-6. We head for another tie-break.

No sign of a break in the 11th game with Del Potro getting his blow in first. Berdych must serve to carry us into a second set breaker. Plenty of bludgeoning winners from both men, but the bite off the Del Petro groundstrokes are suddenly carrying a bit more energy.

Much better from Berdych in that game. Little or no difficulty in holding serve. Berdych doing a spot of stretching. Coming down to the business end of this set and we are no clearer in finding out the destination of the set.

Del Potro holds to love as Berdych clips a forehand onto the top of the net before seeing the loose ball fly out of play. Number six seed Berdych must serve to stay in the set otherwise we are heading for a third set to settle this match. Difficult one to predict with both men dominant in spells so far.

Berdych gets himself out of a tight spot by throwing down a couple of aces from 30-30. Really needed a couple of big serves and cheap points with the momentum going away from him. We are level at 4-4. The heat well and truly on in Madrid.

Del Petro winning 15 of the past 20 points on his way to moving one game clear in the second set. Looked a beaten man a few games ago, but the tone of this match has changed. Questions suddenly being asked of Berdych, whose game has dropped a few gears.

BREAK TO DEL POTRO! Berdych seems to have taken his foot off the gas as Del Potro races 30-0 clear. A forehand from deep collapses into the net, and suddenly Berdych is facing three break points. The Czech saves one break point, but Del Potro drives home a winner seconds later to restory parity. We are back on serve in this set.

A poor returning game from Berdych as Del Potro breezes through his latest service game to love. A 3-2 lead for Berdych, who will serve for a 4-2 lead. Berdych has won 74% of points on first serve. Must lift himself here.

A 40-30 lead for Berdych in the fourth game, but he calms his nerves with a blistering first serve that Del Potro can only empty into the net. Berdych three games away now from the final. Can Del Potro rescue himself here?

Del Potro finds enough reserves of strength to hold in the third game. Staring down the barrel here with Berdych a set and a break up, but anything can happen on this blue clay. Berdych now up to eight aces in the match.

Berdych seems to be on the verge of the final here. Looking the stronger figure the longer this match progresses. Del Potro not coping too well when he is forced to move. Berdych drops one point in that game to cement the break. He leads 2-0 with the break.

BERDYCH BREAKS! Del Potro loses the first two points of the second set on serves, but immediately recovers with a couple of momentous blows. Berdych brings up break points by latching onto a short Del Petro ball to convert a winner across court on the forehand side. A fine return is too good for Del Potro as Berdych moves 1-0 ahead in this set.

SET BERDYCH! Berdych starting to exert himself as an ace carries the Czech player 3-1 clear in the breaker. A winner up the line gives him a 4-1 lead with Del Potro starting to look a little flustered. Someone in the crowd needing a spot of treatment before Del Petro continues to flounder as Berdych moves 5-1 ahead only for the Argentine to come up some excellent points in winning the next four points to level at 5-5. Another Del Potro error followed by a forehand winner seals it for Berdych.

Berdych pumping his fist after levelling at 15-15. Threw in a couple of poor shots on the volley, but manages to go unpunished. Keeps his cool. Del Potro moves 30-15 clear with a timely ace. A couple of errors fly off the racket of Berdych. We are all square at 6-6 in the first set. Tie-break time to settle this first set.

Another tight game, but Berdych gets out of it holding his serve despite throwing in a double fault. Del Petro tugs a shot wide at 30-30 before Berdych slams away an overhead winner for a 6-5 lead. Del Potro must hold serve to force the breaker.

BERDYCH BREAKS! Del Potro has missed eight out of nine first serves. Looks to be in all sorts of trouble on serve and is duly punished for a series of errors as Berdych breaks back to love to level at 5-5. Del Potro looks decidely unimpressed with something.

Berdych keeps his opponent honest by holding again with Del Potro's movement appearing to be restricted by the pace of Berdych's groundstrokes, but he will need to find a break here otherwise Del Potro will trouser the opening set.

Berdych wins the first two points with a couple of crushing winners. He continues to try to maintain this aggressive stance only to bundle a forehand into the court holding a 30-0 lead. Suddenly it becomes 30-30 as Berdych clips the net with a backhand attempt from deep. Berdych is again long seconds later with a backhand before an ace from Del Potro completes the hold for a 5-3 lead.