One of the more interesting storylines this year has been the rise of the perennial underachievers that are the New York Mets and Chicago Cubs. It’s still early days, however, and it remains to be seen whether either side can maintain their excellent form up over 162 games. Here are a couple storylines that are shifting Major League Baseball’s listings in Vegas early on.

Can the Mets sustain their fast start?

New York baseball is definitely alive and well. The Yankees are right back on top of the AL East and the Mets, after years of languishing in the bottom of the standings, have risen to the top of the NL East.

As of April 27, the Mets own the majors’ best record with a 15-5 slate. They have managed to accomplish the feat with the help of their strong pitching. The Mets are second in the National League in the ERA department with a 2.93 average. Leading the way for the Mets are Bartolo Colon (2.77 ERA) and the returning Matt Harvey (3.04 ERA). Both pitchers are undefeated in their four respective starts.

That’s a great start but things could change for both hurlers, and fast. Colon is turning 42 at the end of May, and while he has been healthy lately, a 42-year old body could break down at any moment. Harvey, in the meantime, is just getting into his second full season as a pro, and while his body should hold up, the sample size remains small for him. Still, this MLB betting site has the Mets’ odds of winning the World Series pegged at +1,200.

Can the Cubs’ young guns deliver the goods?

Another team which has looked good early is the Chicago Cubs. After their 4-0 win against Pittsburgh on April 27, the Cubs have now won 11 of their first 18 games, their best start to a season since 2008.

Key to their strong start has been the excellent play of their young players. Third baseman Kris Bryant has lived up to expectations, hitting .351 for the season with eight walks and nine RBIs in his first 10 games. Starlin Castro is having a solid start as well, batting .324 with two homers and 11 RBIs in his opening 18 games. Addison Russell got in on the youth movement as well with a three-run double against the Cincinnati Reds in a 5-2 win.

There’s tremendous upside with this Chicago team and the Cubs will only get better as the season progresses. These are mostly blue chip prospects delivering the goods they were expected to deliver, so the Cubs could easily maintain this pace. The Cubs are pegged at +1,400 to end their 107-year World Series title drought this season.