Sussex believe they have secured the most in-demand spin bowler on the global scene with the recruitment of Afghanistan's Rashid Khan for the 2018 Vitality Blast.
The 19-year-old leg-spinner is ranked second amongst Twenty20 international bowlers behind New Zealand's Mitchell Santner.
Khan made his international debut for Afghanistan as a 17-year-old in October 2015 and has gone on to claim 47 wickets in 29 T20Is at an incredible average of 13.72.
That is the lowest of any bowler in more than a dozen years of Twenty20 internationals and his economy rate of 5.86 runs per over is second only to former New Zealand left-arm spinner Dan Vettori, who finished his career with a mark of 5.70.
Of the ICC's reigning associate nation player of the year award, Sussex's director of cricket Keith Greenfield said: "Rashid is the most sought-after spin talent in the world currently.
"He has made a significant impact in all the teams he has played for to date, so to make this move happen and have him join the other exciting talent we already have in our T20 line up is fantastic."
Rashid recently won the Big Bash League with Adelaide Strikers, where he played under incoming Sussex coach Jason Gillespie.
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