Marcos suffered a first-round exit at the Chengdu Open, falling 7-6(7) 1-6, 6-2 to Malek Jaziri. It was a strong effort, but he would fall after two hours and 11 minutes.
Marcos, who reached the final in Chengdu last year, was making his third appearance at the ATP World Tour 250 event. He fired 12 aces and converted two of six break chances.
They remained on serve in the first set and Marcos would hold a set point at 6-5, but dropped the opener after 65 minutes. He stormed back to grab the second set and force a decider, breaking twice in a row. But Jaziri was too strong in the third, eventually prevailing on his first match point.
It was Marcos' first meeting against Jaziri. He is next scheduled to continue his Asian swing in Beijing and Shanghai.