Källberg lost in straight sets (4–11, 9–11, 11–13) to French star Alexis Lebrun. The first-round match was over after just 24 minutes and 37 seconds.
Compatriot Elias Ranefur also exited in the first round after a 1–3 loss to Belgian Adrien Rassenfosse.
Things went even better for Truls Möregårdh, who defeated Quadri Aruna of Nigeria in straight sets (14–12, 11–6, 11–5).
