- 연합 => united; association.
- 데뷔전 => debut match; debut game.
- 역대 => history making; historical; legendary.
- 역대 기록 => historical record(s); historically significant record(s).
- 성적을 통하다 => ~을/를 통해(서) means "based on; by means of". 통하다 in this sense can't come at the end.
- 다투다 => contest; contend; compete.
- 다투게 되다 => will be contesting/competing (for something); will become a contender.
- 따내다 => earn (a qualification, place, position, etc); earn points/score - it is context dependent.
- 경우의 수 => number of possible cases; (number of) all probable cases.
- 상황을 맞다 => meet with a situation; find oneself in certain situation.
- 메달권 => (in) reach of medals; (in) a medaling stage.
- 이쯤 => (just) about here; about now; at about this point; hereabouts;
- 운동하고 담을 쌓다 => build a wall against sports; never engage in sports.
- 이에 따라 차준환은 이번 7차 대회 성적을 통해 이번 시즌 그랑프리 시리지에 출전한 선수 가운데 성적이 가장 좋은 6명이 출전하는 그랑프리 파이널 출전권 확보를 다투게 된다. (시리지 -> 시리즈 = series)
=> Hence 차준환 will be competing for a place in the Grand Prix Final which admits the best scoring six contestants in this season's Grand Prix Series based on their scores in the seven competition events so far.
성적을 통해 means "(judged) based on the scores". It can be rephrases as 성적을 기준으로 (해서) or 성적에 의해(서).