Table: katerina maleeva
Question: What is the probability of Katerina Maleeva winning a match after winning the first set?
Step 1 (Operation, Filter): result where win first set
Step 2 (Reasoning, Aggregating): COUNT, number of rows
Step 3 (Reasoning, Aggregating): COUNT, number of wins in the last set
Step 4 (Reasoning, Arithmetic): ratio, two counts above
Answer: 0.9048