21 off 1 ball. The rain rule, the circle, the tie and the boundary count: four rules that decided World Cups.
THE RAIN RULE, SYDNEY 1992 — South Africa needed 22 off 13; after rain it was 21 off 1.
THE CIRCLE, 1996 — Two fielders outside for 15 overs; Sri Lanka won batting second.
THE TIE, EDGBASTON 1999 — Australia went through on Super Six position.
THE BOUNDARIES, LORD'S 2019 — England won the Super Over tie-break on boundaries, 26 to 17.