2020 SeasonAll times ET
Veteran forward Max Kruse scored for his sixth different Bundesliga club as Union Berlin thrashed Mainz.
Mainz have sacked coach Achim Beierlorzer after a turbulent week which included a players' strike and a 4-1 defeat to VfB Stuttgart.
Mainz sporting executive Rouven Schroder had said that Szalai should look for a new club.
RB Leipzig eased past Mainz 05 3-1 in their Bundesliga opener on Sunday to enjoy a successful start to league life without striker Timo Werner.
Liverpool loanee Taiwo Awoniyi, while at Mainz, clashed heads with Augsburg's Felix Udoakhai and lost consciousness before hitting the ground.
Mainz 05 scored either side of the break through Jonathan Burkhardt and Jean-Philippe Mateta to stun hosts Borussia Dortmund 2-0 on Wednesday.
Mainz 05 scored once in each half to beat Eintracht Frankfurt 2-0 on Saturday and move three points above the Bundesliga relegation playoff spot.
Hoffenheim substitute Ihlas Bebou scored with almost his first touch as they beat Bundesliga strugglers Mainz 1-0 away on Saturday.
Marcus Ingvartsen netted a well-taken free kick to earn 10-man Union Berlin a battling 1-1 draw against fellow strugglers Mainz in the Bundesliga.
Timo Werner scored a hat trick as RB Leipzig demolished hosts Mainz 5-0 on Sunday to reclaim third place in the Bundesliga.
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