What Does a +1.5 Spread Mean? A +1.5 spread is commonly seen in baseball betting, the standard runline  for MLB. This spread means the underdog must win outright or lose by exactly one run to cover the spread. Alternatively, a -1.5 spread means that the favorite must win by at least two runs.

You may have heard this slang term batted about online. Initially, new Betfairian's are confused. It's really simple though: A 'tick' is simply an incremental difference in price. Typically on a betting exchange, such as Betfair.