TOPSHOT - Arsenal's Chilean striker Alexis Sanchez celebrates scoring his team's first goal during the English Premier League football match between Middlesbrough and Arsenal at Riverside Stadium in Middlesbrough, northeast England on April 17, 2017. / AFP PHOTO / Lindsey PARNABY / RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or 'live' services. Online in-match use limited to 75 images, no video emulation. No use in betting, games or single club/league/player publications.  /         (Photo credit should read LINDSEY PARNABY/AFP/Getty Images)