Gareth Bale, Aaron Ramsey & Co. have gone winless in four friendlies since clinching their place in the competition but will look to turn around their fortunes where it counts, on the grand Euro stage. Slovakia, meanwhile, enters unbeaten in eight matches and having just beaten reigning World Cup champion Germany in a pre-Euro friendly. It counters Bale's starpower with longtime Napoli midfielder Marek Hamsik.
Follow all the action in the gamecast below, and for full standings, statistics and schedules visit our Euro 2016 home.
Wales's next group match comes against border rival England, while Slovakia takes on Russia. Both matches are June 15.