Lee Jae-sung played the first half as Mainz lost 3-1 to Eintracht Frankfurt at home Saturday, its first defeat of the season.
Can Uzun scored twice for Frankfurt at Mewa Arena, while former Mainz forward Jonathan Burkardt added a goal in first-half stoppage time.
Mainz had opened its Bundesliga season with a 0-0 draw against Paderborn and a 5-0 win over Hamburg. It also beat VfB Krieschow 9-0 in the first round of the German Cup on Aug. 24, making Saturday's defeat its first in four competitive games.
Lee started in an attacking midfield role but recorded no shots and one cross before Ransford-Yeboah Konigsdorffer replaced him at halftime. He had provided an assist in both the cup victory and the win over Hamburg.
Uzun put Frankfurt ahead in the ninth minute. Mainz's goalkeeper saved a penalty in the 43rd, but Burkardt scored before halftime to make it 2-0.
Uzun added his second goal in the 60th minute. Philipp Tietz scored for Mainz in the 89th.
Elsewhere, Seol Young-woo came off the bench as Augsburg drew 2-2 with Bayer Leverkusen at WWK Arena.
After conceding in the 18th minute, Augsburg took a 2-1 lead through Michael Gregoritsch's goals in the 50th and 55th.
Seol replaced right wing back Marius Wolf in the 77th minute, making his third consecutive substitute appearance since joining Augsburg this season.
Leverkusen equalized in the 89th minute. Augsburg remained unbeaten through three league games with two wins, one draw and seven points.
(This article was produced with the assistance of AI. — Ed.)
