5 players with the worst 50 to 100 conversion of all time in Tests 

#3 Alec Stewart – 25%

Alec Stewart

Alec Stewart is arguably the greatest wicket-keeper batsman England have ever produced. A stylish batsman and a reliable keeper, Stewart was an integral member of both formats throughout the 1990s.

He made his debut in 1990. Though he had a pretty sedate start to his career with both the bat and gloves, England persisted with him. Slowly, as he grew in experience, he started giving impressive performances.

He slowly turned into a reliable batsman who could not only keep for long hours but also could bat anywhere in the batting order. At one point in his career in 1992, he averaged 46.10 with 6 fifties and 4 hundreds (those 4 centuries came in the span of 8 innings).

However, after that period, he couldn’t convert those starts (fifties) into hundreds regularly. Thus, in his 133-Test career he scored 15 hundreds and 45 fifties and had a conversion rate of only 25% which puts him third on this list.