Mainz have renewed the contract of midfielder Nadiem Amiri by two years until 2028 after he helped them avoid Bundesliga relegation. Amiri, 27, arrived in January from champions Bayer Leverkusen, scored once and had four assists. Mainz were third last at the winter break but eventually finished 14th to stay in the top flight. “The signing of Nadiem in the winter provided the team with exactly what we wanted,” board member for sport Christian Heidel said in a statement on Tuesday. “His creativity and technical ability immediately improved the attacking side of our game and he gave his all for t…