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Lyon, who is playing in his 100th consecutive Test, was running in to take a catch of Ben Duckett off the bowling of Cameron Green in the leg-side after tea, when he pulled up sharply while running towards the ball.
Englishman Anderson replaced Australian legend McGrath as the most prolific pace bowler in Test cricket by picking up his 564th wicket at the Oval.
McGrath said the growing popularity of the T20 cricket is good for the sport and probably the new fans with embrace the challenging Test format.
Recalling the controversial decision, Harper said he still thinks about that dismissal even after 20 years and stands by the call he made that day.
Anderson, playing in his 156th match, became the first seamer to capture 600 wickets in the game's longest format.
Results 1-5