Juan Manuel La Serna will advance against Luca Staeheli in the 2026 ATP Challenger Sion Round Of 16 on August 19, 2026. The 22 year old La Serna will upset Swiss Luca Staeheli and will push to improve on his current No. 298 ranking with 180 PTS and to approach his career high of 282. La Serna arriv…