Their site (like most) states the following: "All regular season and exhibition baseball games are considered official after 5 innings of play (4½ if the home team is winning). If a game is called or suspended after 5 innings, the winner is determined by the score after the last full inning of play – unless the home team scores to tie or takes the lead in the bottom half of the inning, in that case, the winner is then determined by the score at the time the game is called. When betting on baseball totals or run-lines, the game must go 9 innings or 8½ if the home team is winning.(These rules also apply to all wagers on Live Betting Extra, Sportsbetting Prime, Sportsbetting Plus and Live Betting Ultra and Prematch Betting)."
Since game was called/suspended in top of 10th, 4-4 would be the official score. Runline would lose, and how about that, you can get a tie in regular season MLB (if you had the ML).