this should answer your question. its right from the TGL TF2 Ruleset.
1.4 International Team Eligibility and Restrictions
International teams are free to register, compete, and win cash prizes in this League. However, all international teams must agree to play on US based servers at the established default match time (9:30 PM Eastern US time zone). Teams within the US may coordinate an alternate match time and server arrangement as needed, but the TGL will not force US teams to play on international servers at inconvenient times unless they voluntarily choose to do so.
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