Kecmanovic succeeded Dominic Thiem as champion, with the Austrian winning his home tournament last year. The third-ranked Thiem was set to play Alexander Zverev in the final of the U.S. Open later Sunday.
Kecmanovic’s triumph concluded the first tournament in ATP tour history with three qualifiers in the semifinals.
The clay-court event was rescheduled from July and a limited number of spectators were allowed into the 5,400-capacity stadium.
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