I have tried that before on lesser tournaments with players that were not familiar and
based on the odds of the match. It turned out to be a wasted excersize, some
winners but mostly losses. I stick with the familiar players now.
When I am betting on lower tier tournaments I rely on info from pages like
tennis explorer. I check players recent form and especially his proficiency on that particular surface. Then I make bets if I can find value. For instances bookies are basing their odds almost exclusively on player's rank when it comes to players below ATP 200 and you can often find a player ranked 250 who lost all their matches in last 3 months playing against indoor specialist ranked 500. In those situations +5.5 handicap on that indoor specialist is almost free money and ML has lots of value as well. This is drastic example but you can find a couple of badly set odds in early rounds of every small tournaments.