By Frank Dalleres Triathlete Marten Van Riel has promised to spend his prize money at one of the city’s casinos as he chases a hat-trick of wins at Lake Las Vegas T100 this weekend. The Belgian continued his 100 per cent record on the T100 Triathlon World Tour with victory in Ibiza last month and can make it three from three on Saturday in Nevada. Fellow athlete Aaron Royle revealed Van Riel’s casino pledge on the Pro Tri News podcast, saying: “Marten said whatever he wins in Vegas he’s putting it on red.” The 31-year-old, who also won in San Francisco in June, can ensure he goes into next mon…