The 2023 Brest Challenger, known as the Open de Brest Crédit Agricole, was a professional tennis tournament played on hardcourts. It was the eighth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Brest, France between 23 and 29 October 2023.

Singles main-draw entrants Seeds Country Player Rank1 SeedRichard Gasquet621Nuno Borges742Jaume Munar833Benjamin Bonzi894Constant Lestienne935Hugo Gaston966Liam Broady1007David Goffin1058 1 Rankings are as of 16 October 2023.

Other entrants The following players received wildcards into the singles main draw: Titouan Droguet Richard Gasquet Giovanni Mpetshi Perricard

The following players received entry into the singles main draw as special exempts: Kyrian Jacquet Dennis Novak

The following players received entry from the qualifying draw: Duje Ajduković Gabriel Diallo Arthur Fery Calvin Hemery Matteo Martineau Ryan Peniston

The following players received entry as lucky losers: Geoffrey Blancaneaux Gijs Brouwer Frederico Ferreira Silva

Champions Singles

Pedro Martínez def. Benjamin Bonzi 7–6(8–6), 7–6(7–1).

Doubles

Yuki Bhambri / Julian Cash def. Robert Galloway / Albano Olivetti 6–7(5–7), 6–3, [10–5].

References