Complex sentence: In the main draw, he was drawn against sixth seed and world number 28 Jürgen Melzer of Austria in the first round and caused a huge upset by winning in straight sets 7--5,6--1.
Split into simpler sentences: In the main draw, he was drawn against sixth seed and world number 28 Jürgen Melzer of Austria in the first round. He caused a huge upset by winning in straight sets 7--5,6--1.