2021 Ostrava Challenger

{{TennisEventInfo|2021|Ostrava Challenger|

| date=26 April – 2 May

| edition=18th

| surface=Clay

| location=Ostrava, Czech Republic

| champs={{flagicon|FRA}} Benjamin Bonzi

| champd={{flagicon|AUS}} Marc Polmans / {{flagicon|UKR}} Sergiy Stakhovsky

| before_name=Prosperita Open

| after_name=Ostra Group Open

}}

The 2021 Ostrava Challenger was a professional tennis tournament played on clay courts. It was the 18th edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Ostrava, Czech Republic between 26 April and 2 May.

Singles main-draw entrants

=Seeds=

class="sortable wikitable"
width="70"| Country

! width="175"| Player

! Rank1

! Seed

{{flag|FRA}}

|Grégoire Barrère

|118

|1

{{flag|BRA}}

|Thiago Seyboth Wild

|124

|2

{{flag|FRA}}

|Benjamin Bonzi

|127

|3

{{flag|FRA}}

|Arthur Rinderknech

|129

|4

{{flag|AUS}}

|Marc Polmans

|148

|5

{{flagu|USA}}

|Maxime Cressy

|156

|6

{{flag|CHI}}

|Alejandro Tabilo

|162

|7

{{flag|EGY}}

|Mohamed Safwat

|164

|8

  • 1 Rankings are as of 19 April 2021.{{cite web|url=http://www.atptour.com/en/rankings/singles|title=Rankings – Singles – ATP Tour – Tennis|website=ATP Tour}}

=Other entrants=

The following players received wildcards into the singles main draw:

The following player received entry into the singles main draw as an alternate:

The following players received entry from the qualifying draw:

Champions

=Singles=

{{main|2021 Ostrava Challenger – Singles}}

=Doubles=

{{main|2021 Ostrava Challenger – Doubles}}

References