Alexander Zverev says a malfunctioning glucose sensor affected his performance in his Halle semi-final against Christopher Eubanks Fritz. According to Zverev, the sensor displayed high blood-sugar readings while his actual levels were low. He adds that this discrepancy led him to inject more insulin than he intended. Zverev links the resulting mismatch in his blood-sugar control to difficulties during the match, which culminated in his loss. The reports also indicate that Zverev is raising the issue to explain factors that may have contributed to how he felt and how he played during the decisive stage of the tournament. Neither outlet attributes wrongdoing to anyone; instead, Zverev frames the incident as a device malfunction and an error in interpreting the readings. The match outcome remains that Zverev loses the semi-final, while the explanations provided focus on how his glucose management went awry during the event.