![Juan Martin Del Potro of Argentina argues a line call on a serve by Roger Federer of Switzerland with chair umpire Mohamed Lahyani after electronic line review was not available during their Juan Martin Del Potro of Argentina argues a line call on a serve by Roger Federer of Switzerland with chair umpire Mohamed Lahyani after electronic line review was not available during their](https://c8.alamy.com/comp/2CYPXBF/juan-martin-del-potro-of-argentina-argues-a-line-call-on-a-serve-by-roger-federer-of-switzerland-with-chair-umpire-mohamed-lahyani-after-electronic-line-review-was-not-available-during-their-quarter-final-match-at-the-indian-wells-atp-tennis-tournament-in-indian-wells-california-march-16-2012-reutersdanny-moloshok-united-states-tags-sport-tennis-2CYPXBF.jpg)
Juan Martin Del Potro of Argentina argues a line call on a serve by Roger Federer of Switzerland with chair umpire Mohamed Lahyani after electronic line review was not available during their
![US Open: Roger Federer wades into Nick Kyrgios row and BLASTS umpire Mohamed Lahyani | Tennis | Sport | Express.co.uk US Open: Roger Federer wades into Nick Kyrgios row and BLASTS umpire Mohamed Lahyani | Tennis | Sport | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/72/750x445/1010962.jpg)
US Open: Roger Federer wades into Nick Kyrgios row and BLASTS umpire Mohamed Lahyani | Tennis | Sport | Express.co.uk
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