Jiří Lehečka defeated Gabriel Diallo 6–4, 6–2 in the second round of the ATP 250 Queens Club Championship on grass on 19 June 2025, confirming his status as pre-match favourite with odds of 1.56 to Diallo's 2.61. Lehečka's commanding performance saw him break serve consistently and control the rhythm throughout both sets, with the Czech player dictating points and limiting his opponent's opportunities on the quick surface. Diallo, despite competing at one of the season's most prestigious grass-court events, struggled to find his rhythm and could not sustain pressure against Lehečka's composed baseline play and serve. The decisive margin—dropping only six games across two sets—underscores Lehečka's comfort on grass and his ability to convert his favoured status into a convincing result, positioning him favourably for the quarter-finals at the Hurlingham Club venue.