Karlovic downs Berdych
Ivo Karlovic claimed the scalp of fourth seed Tomas Berdych in the opening round of the Qatar Open in Doha.
Karlovic served 25 aces and had 49 winners against his opponent's eight aces and 28 winners, as neither player managed to break serve in a 7-6 7-6 scoreline.
It represents a poor start to the new campaign for Czech Berdych, who was the only top 10 player who did not win an ATP tour title in 2013.
Britain's Dan Evans enjoyed a rare victory in the qualifying round as he beat Japan's Taro Daniel in straight sets.
The British number two, who has failed to reach the same heights after making the third round of last season's US Open, won 6-2 6-2 to enter the main draw.
In the first round Evans will take on Latvian world number 24 Ernests Gulbis.
Meanwhile, Andy Murray continued his comeback from surgery when teaming up with Nenad Zimonjic of Serbia in the doubles.
The pair lost the first set 6-3 to German pair Daniel Brands and Florian Meyer but hit back to take the next 7-6 (7/5) on the tie-break.
That took the match into a champions tie-break and Murray and Zimonjic won that 10-8.
The world number four had returned to action in the Mubadala World Tennis Championship exhibition in Abu Dhabi on Boxing Day following back surgery.
The Wimbledon champion lost to Jo-Wilfried Tsonga before beating Stanislas Wawrinka to finish fifth in the exhibition tournament.
He had a minor operation on a long-standing back problem in September, bringing an early end to his season.