VIDEO: Ostapenko asked for opinion on line-calling system with usual brutally honest fashion, makes umpire James Keothavong laugh

Jelena Ostapenko made everyone laugh after beating Coco Gauff when she jokingly said that she doesn't believe in the line calling system.

Ostapenko can be seen often looking at her box asking her coach whether the ball was in or not. She was asked about that and whether she believes that the system works and she was quite open saying:

"To be honest, no. I feel like somethimes it makes mistakes."

Her comment even made umpire James Kothavong laugh. Check it out below.