The NL West remains the hardest division race to call in all of baseball, as once again the Diamondbacks and the Dodgers entered the week tied for first place.

The Dodgers and D-Backs will both be scoreboard-watching this week when Arizona hosts San Diego for three games, and Los Angeles hosts the Rockies for three games.

But what are the best baseball series to bet on this week? Philly and Washington should be one-sided with not much betting line value, ditto the Red Sox and Orioles.

Go west, young man, for the week's best value.

Arizona is 7-5 versus the Padres in 12 previous games this season, but they're only 3-3 at home. The Diamondbacks appear to be in good hands with Doug Davis on the mound in Tuesday's game after Davis pitched 7 2-3 shutout innings against San Diego the last time he faced them.

Josh Banks is scheduled to start for San Diego, and he's 0-1 with a 4.50 ERA against Arizona. Check out , the sportsbook best known for having the industry's best baseball underdog odds.

The Diamondbacks should also feel good about securing wins on Wednesday and Thursday, with Dan Haren and Brandon Webb on tap to start. Haren is 2-1 with a 2.14 ERA in three starts against the Padres.

Webb has only faced San Diego once this year, but he pitched six shutout innings in that start. Haren will be in tough against San Diego ace Jake Peavy, while Webb goes up against veteran Greg Maddux.

The Dodgers are 7-5 this season against Colorado, with a 4-2 record at Dodger Stadium. On the mound for Los Angeles on Tuesday will be Hiroki Kuroda, who surrendered five runs in six innings the last time he faced Colorado. Ubaldo Jimenez gets the call for the Rockies, and he went the distance against the Dodgers the last time he faced them, allowing only one run on four hits.

Also set to take the mound for Los Angeles in the series are Chad Billingsley and Derek Lowe. Somehow Billingsley has missed Colorado so far this season, but he is 0-2 with a 6.46 ERA in six career appearances against them.

Lowe is 1-1 with a 4.15 ERA in two starts against the Rockies this year. Getting the start for the Rockies for those games will be Jeff Francis and Jorge De La Rosa.