- Bats Right, Throws Right
- Height 6' 0", Weight 176 lb.
Alex Seidl has pitched for the Austrian national team.
He debuted with the 2015 Stock City Cubs in the Austrian Baseball League, going 1-1 with a 6.55 ERA and 3-for-28 at the plate as a 16-year-old.  The next year, he was 2-4 with a save and a 5.73 ERA while hitting .129/.237/.129.  In '17, he improved to 1-2, 3.93 with 3 saves while batting .160/.267/.160. He tied former AA hurler Chris Squires for the league lead in saves. 
His first time with the Austria's senior national team in the 2017 B-Level European Championship; he was their youngest player, about 7 months younger than Moritz Scheicher. He did not get into a game as Austria won the event.  In 2018, he hit .321/.398/.367 and 6-6, 3.96 on the mound. He was 4th in the ABL with 84 IP, 4th in wins, tied for 2nd in appearances and tied Werner Harrasser for 3rd in losses.  He was with Austria in the 2018 European Championship Playoff but again did not appear in a contest (they only used three pitchers in their two-game sweep of Lithuania to win a spot in the 2019 European Championship. 
Seidl moved to the Vienna Matrostars in 2019. He hit .250/.387/.250 and was 3-1 with a save and a 2.27 ERA. He was 3rd in the ABL in ERA (the best of any Austrian native) and 5th in opponent average (.223).  He was named an ABL All-Star.  He was back with Austria in the 2019 European Championship. Not only did the 20-year-old get to pitch this time, but he got the first win ever for Austria in a European Championship (they had been 0-6 in the 2007 European Championship and 0-3 to begin 2019). It was a masterpiece, as he needed only 89 pitches to beat Croatia in a seven-inning mercy rule win. He allowed just two hits - to Slobodan Gales and Ronnie Krsolovic and one run, walking one and striking out two. Despite the 1.29 ERA, he did not lead Austria's qualifiers in the event as Tobias Kiefer was at 1.00 and the other qualifier on the team, Christian Tomsich, was also at 1.29. Of the non-qualifiers, though, Austria had a 13.13 ERA). He tied Jan Tomek and Tomsich for 8th in the Euros in ERA. 
He did not play in 2020, then was 3-0 with a 4.50 ERA in 2021.