Wrist spinner Yasir Shah has scaled the number spot in the ICC Test rankings, becoming the first Pakistani bowler to do so since Mushtaq Ahmed achieved the feat in December 1996.He reached the number-one spot after bowling Pakistan to a 75-run victory over England in the first Test at Lord's on Sunday.Yasir, who returned with figures of six for 72 and four for 69, has leapfrogged India spinner Ravichandran Ashwin and England's fast bowling pair of James Anderson and Stuart Broad into the top spot after his achievement earned him 32 points.In the Test Batsmen rankings, Australia's Steve Smith maintained his top spot ahead of New Zealand's Kane Williamson. In Test team rankings, Australia and India currently take the top two places, followed by Pakistan and England at third and fourth spots.