2021 Open de Oeiras II
The 2021 Open de Oeiras II was a professional tennis tournament played on clay courts. It was the second edition of the tournament, part of the 2021 ATP Challenger Tour. It took place in Oeiras, Portugal between 5 and 11 April 2021.
Singles main-draw entrants
Seeds
1 Rankings are as of 22 March 2021.Other entrants
The following players received wildcards into the singles main draw:The following player received entry into the singles main draw as a special exempt:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw: