"Entry frag in CS2, defined"

An entry frag is the first kill of a round — the opening duel.

It is the highest-leverage single event in a Counter-Strike round. The team that takes the opening kill plays the rest of it a player up, with the map control that follows. Round-win probability after winning the opener is dramatically higher than after losing it, which is why dedicated entry players exist despite carrying unflattering death counts.

This is also why kill/death ratio undervalues entries. The entry fragger's job is to take a coin-flip duel first, so teammates play a 4v4 with information rather than a 5v5 blind. Losing that duel is often not a mistake.

The complement is the trade — a teammate immediately killing the opponent who took the entry, restoring the numbers. Trades are counted by KAST.

Opening-duel data is available through the CS2 data API.