Somdev Devvarman avenged a Chennai finals loss to Marin Cilic by upsetting the Croatian sixth seed 7-5, 6-4 on Tuesday to reach the third round of the ATP Washington Classic.

In what he called his greatest career victory, the 24-year-old qualifier who ranks 153rd connected on 62 per cent of his first serves and saved 5-of-7 break points to advance past 15th-ranked Cilic after one hour, 42 minutes.