get up on~

NBAは昨シーズンの覇者the Golden State Warriorsが現在27勝1敗と圧倒的な強さでカンファレンスの首位をひた走っています。記事はNYTからの引用です。
今回採り上げるのはget up on~という句動詞。get upには「〖方向の副詞を伴って」行く, 訪れる」という意味があります（『プログレッシブ英和中辞典』小学館）。方向の副詞としてはtoが用いられることが多いようですが，本文ではonが用いられており，toよりも相手に接近している様子が伝わってきます。ここでは「〜を1対1でマークする」あたりでしょうか。
記事の25はNBAでのリングから3Pラインまでの距離を指しており，以上から，文は「もしノーマーク（フリー）にしてしまえば，Curry選手に3Pを打たれてしまうし，3Pラインまで出てマークをすればさらにその後ろ（リングから30フィート）からシュートを打たれてしまう。30フィートの距離まで出てマークをすれば，彼に抜かれてしまうだろう」と解釈できます。（Koyamamoto）

Can the Unbeatable Warriors Be Beaten?
The Golden State Warriors will take an intimidating 27-1 record into their Christmas Day showdown with LeBron James and the Cleveland Cavaliers, the group they conquered in six games in last season’s N.B.A. finals. As good as the Warriors were then, they are better now, led by the increasingly amazing Stephen Curry, who has bumped James aside as the most dynamic player in the league.
So how do you beat Curry and his supporting cast? How do you cope with a team that ranks No. 1 in the league in offense, and a respectable No. 7 in defense, and uses the 3-pointer to simply overwhelm the opposition? The New York Times posed those questions to some smart basketball minds at all levels of the game — high school, college and the pros.

Pete Carril, former Princeton coach and Sacramento Kings assistant. Carril was known for slowing the pace in the college game, albeit with a longer shot clock.
“I’ll tell you, this kid Curry is probably the best shooter I’ve ever seen — that’s 70 years. Where’s the flaw? He’s an expert dribbler, very fast, sees everyone who’s open. If you don’t get up on him, he shoots from 25. If you get up on him at 25, he shoots from 30. If you get up on him at 30, he’ll go by you. He also guards people. And he’s playing with other shooters — anybody on that team can make a 3-pointer, and Klay Thompson is about as good at it as Curry.
http://www.nytimes.com/2015/12/25/sports/basketball/golden-state-warriors-cleveland-cavaliers-christmas-day.html?hpw&rref=sports&action=click&pgtype=Homepage&module=well-region®ion=bottom-well&WT.nav=bottom-well&_r=0