Lukas Klein / Jaroslav Pospisil become the alternate team and fill the vacant spot.
The match will be rescheduled to a later time today, so that Lukas Klein can rest after his singles match before playing doubles.
RHEIN ASSET OPEN 2021 – MEERBUSCH, GERMANY €44,820
9-15 August 2021
 D. Molchanov (UKR) / A. Nedovyesov (KAZ) vs. [Alt] L. Klein (SVK) / J. Pospisil (CZE)
A. Sancic (CRO) / A. Sitak (NZL) d [WC] F. Fallert (GER) / J. Haerteis (GER) 75 64
 D. Brown (GER) / R. Haase (NED) d H. Hach Verdugo (MEX) / M. Reyes-Varela (MEX) 64 62
R. Gonzales (PHI) / H. Johnson (USA) d [WC] C. Schmitz (GER) / P. Tsitsipas (GRE) 76(2) 61
D. Ajdukovic (CRO) / N. Fatic (BIH) vs. [WC] A. Merino (PER) / S. Mochizuki (JPN)
J. De Jong (NED) / B. Stevens (NED) d  A. Begemann (GER) / A. Olivetti (FRA) 64 75
J. Ficovich (ARG) / N. Kicker (ARG) vs. S. Walkow (POL) / J. Zielinski (POL)
 I. Sabanov (CRO) / M. Sabanov (CRO) d B. Bobrov (RUS) / R. Safiullin (RUS) 62 76(6)