WTA tennis predictions for Sunday, September 27: Under 21 games in Leylah Fernandez vs Talia Gibson

Our model looks at each team's recent form, injuries, rest and the price on offer, and works out how likely each result is. When its number says a bet is more likely to land than the price suggests, the bet makes our list. For each game we show the one main-line bet it likes most. HIGH means it lands about 6 or more times in 10 by our numbers. LEAN means about 4 to 6 times in 10. LONG-SHOT means less than 4 in 10: a bigger payout and a smaller chance. No pick is a sure thing.