Complex sentence: He lost in the first round of the singles main draw to no.25 seed Viktor Troicki in straight sets-that was his first match in the main draw of a ATP World Tour or Grand Slam tournament.
Split into simpler sentences: He lost in the first round of the singles main draw to 25th seed Viktor Troicki in straight sets. It was his first match in the main draw of a ATP World Tour or Grand Slam tournament.