Australian Open champion Stanislas Wawrinka of Switzerland crashed to a shocking second-round defeat at the Madrid Open on Tuesday when he was upset 1-6 6-2 6-4 by Austrian qualifier Dominic Thiem.

Third-seeded Wawrinka, who followed up his title in Melbourne with a win at last month's Monte Carlo Masters, started strongly against the 70th-ranked Thiem, who at 20 years and eight months is the youngest player in the top 100.

Wawrinka lost his way in the second set and was unable to recover in the third as Thiem pulled off his first win over a top 10 player to secure passage to the third round and a meeting with 15th seed Mikhail Youzhny of Russia or unseeded Feliciano Lopez of Spain.