Umpiring & UDRS
They can quite often be the difference between winning and losing, particularly in close contests. The Champions Trophy is a condensed tournament with eight closely-matched sides and a key decision can decide a match.
O is for...OUT!
As he does on many lists, Muttiah Muralitharan leads the way on the number of wickets in the Champions Trophy with 24 wickets from 15 innings in which he bowled.
Right behind him is New Zealand's Kyle Mills with 22 wickets from 12 matches. Mills will almost certainly pass the Sri Lankan spinner and become the leading wicket-taker.
M is for...Misbah
Misbah.
That's right, the Pakistan captain and our best ODI batsman on current form has a massive role to play if Pakistan are to progress in the Champions Trophy.
His performance in the ODI series in South Africa showed that he still can perform against the very best, and as Dav Whatmore said, "Misbah's batting has had a new lease of life".