Hungarian striker Adam Szalai has been released out of his contract at Bundesliga club Mainz and joined Swiss side Basel. Mainz sports director Christian Heidel said on Wednesday: “Ádám came to us with the wish to take up the offer at Basel, which offered him stability beyond the summer. “We accepted his request after some short and intense discussions because we didn’t want to stand in his way.” The contract of the 34-year-old in Mainz would have expired after the season while he signed until 2023 in Basel where the transfer window was open until Tuesday night. Szalai scored 28 goals for Main…