Answer
Less than 2 runs per over. Alan Davidson was an Australian cricketer who played 44 Test matches between 1953 and 1963. He was a left-arm fast-medium bowler and a useful lower-order batsman. Davidson was known for his accuracy and stamina, and he was one of the most economical bowlers of his era. In his Test career, he conceded just 1.88 runs per over, which is a remarkable achievement.