diff --git a/lib/emulator_bet.js b/lib/emulator_bet.js
index 952285e..e5df3e5 100644
--- a/lib/emulator_bet.js
+++ b/lib/emulator_bet.js
@@ -89,6 +89,8 @@ EmulatorBet.prototype.matchWhole = function(price) {
 // for lays, price<=betPrice
 EmulatorBet.prototype.matchPortion = function(price, size) {
     var self = this;
+    if( 1*self.size <0.001 )
+        return false;
     if (1 * size > 1 * self.size)
         return false;
     if (self.betType == 'L' && 1 * price > 1 * self.price)
diff --git a/lib/emulator_market.js b/lib/emulator_market.js
index 2b1262e..0f38960 100644
--- a/lib/emulator_market.js
+++ b/lib/emulator_market.js
@@ -568,6 +568,8 @@ function matchBetsUsingPrices(self, betlist) {
         console.log("EMU: betId=%d selId=%s type=%s", bet.betId, bet.selectionId,
                 bet.betType);
         console.log('EMU: best back=%j lay=%j', player.bestBack, player.bestLay);
+        if(bet.isMatched())
+            continue; // skip already matched bets
         if (bet.betType === 'B') {
             var bestBackPrice = player.bestBack.price;
             var bestBackSize = player.bestBack.amount;