君が勝つとは限らない。

君が勝つとは限らない。

You may or may not win.

君(きみ)が勝(か)つとは限(かぎ)らない。

Kimi ga katsu to wa kagiranai.

君 (きみ)

you; buddy; pal; monarch; ruler; sovereign; (one's) master

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

勝つ (かつ)

to win; to gain victory

と (と)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

限る (かぎる)

to restrict; to limit; to confine; to be restricted to; to be limited to; to be confined to

Readings: クン、きみ、 -ぎみ

Meanings: mister, you, ruler, male name suffix

Readings: ショウ、か.つ、 -が.ち、まさ.る、すぐ.れる、かつ

Meanings: victory, win, prevail, excel

Readings: ゲン、かぎ.る、かぎ.り、 -かぎ.り

Meanings: limit, restrict, to best of ability