 If you liked
IGPX: Immortal Grand Prix
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 ...then you might like
Soukou Kihei Votoms
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Most of the similarities lie in the mecha designs and style than anything else, but if you're into the genre, this is probably one of the reasons you watch a series. I wish that IGPX went with the pilot, but I was still satisfied with the end product.
Anyway, a mecha battling arena plays a big part in the earlier portions of Votom's story, and acts a teaser to draw you deeper into the universe.