Previewing the NL West, which looks like a two-team race

Who wins the National League West, the San Francisco Giants or the Los Angeles Dodgers?

Take your pick.

The Giants fixed their bullpen with former Nationals closer Mark Melancon, and with Madison Bumgarner and Johnny Cueto, have two of the four starters that finished with an ERA lower than 3.00 with at least 200 innings last season.

The others are Tanner Roark and Max Scherzer of the Nationals.

The Dodgers have a healthy Clayton Kershaw - he missed two months of last season with a back injury - and depth in their rotation.

Their bullpen was one of the best in the NL last season, and they kept closer Kenley Jansen, a pitcher the Nationals pursued.

The Arizona Diamondbacks need to reset after falling flat. The Colorado Rockies are a trendy pick to make the postseason, but injuries have hit them this spring.

The San Diego Padres are rebuilding. They'll finish fifth.

Here's a look at the NL West:

ARIZONA: The Diamondbacks are digging out from a 69-93 season that shattered high expectations. Lots of improvement needed, but a tighter defense and healthy players, such as outfielders David Peralta and A.J. Pollock, should move the team in the right direction. ... All eyes are on pitcher Shelby Miller, 26, who flopped last season (6.15 ERA in 20 starts) after coming to the Diamondbacks in a trade from Atlanta for three players, including shortstop Dansby Swanson. Miller, whose spring ERA soared to better than 6.00, says he put too much pressure on himself to justify the trade. He changed back to the more familiar mechanics that helped him post a 3.25 ERA in 95 starts from 2013-2015. ... Another starter looking for redemption is Zack Greinke, 33, the D-Backs' $200 million pitcher who flopped to his second-highest career ERA (4.37) after his 1.93 showing for the 2015 Dodgers. So will Greinke return to Cy Young territory? ... The rest of the rotation includes Taijuan Walker, who arrived in a trade from Seattle, Patrick Corbin and Robbie Ray. The D-Backs hope that Walker lives up to the potential he never reached in Seattle. He had a 4.22 ERA for the Mariners last season. ... The D-backs have two new catchers - Jeff Mathis and Chris Ianetta - replacing Welington Castillo, now an Oriole. ... The lineup is powerful with Yasmany Tomas, Jake Lamb, Pollock, Peralta and first baseman Paul Goldschmidt, who can hit, hit with power, steal bases and play Gold Glove defense. Goldschimdt hit .297 with a .411 on-base percentage last season. ... The most underrated player on the team is second baseman Brandon Drury, who hit .282 in 2016. The Diamondbacks expect even better this season. ... The biggest concern is closer Fernando Rodney, 40, who had 41 strikeouts and 25 walks in 36 2/3 innings last season for Seattle.

COLORADO: The Rockies, under new manager Bud Black, a former big league pitcher, could be a surprise contender, assuming they can improve on their 42-39 record at home. They are trying to break a streak of six consecutive losing seasons. But their spring hasn't been good: Ian Desmond, the first baseman, is out with a broken hand. Mark Reynolds will replace him. ... Chad Bettis, their No. 2 pitcher, has been sidelined because of testicular cancer. Prospect David Dahl will miss opening day with a rib injury, catcher Tom Murphy has a broken arm and pitcher Chris Rusin an oblique injury. ... The rotation is led by Jon Gray, 25. Gray had 185 strikeouts last season as a rookie. Bettis, 27, led the Rockies with 14 wins last season. ... The Rockies' biggest improvement is their bullpen, one of the NL's worst in 2016. Greg Holland, Jason Motte and Mike Dunn were signed to beef up the setup roles for closer Adam Ottavino, 31, whose best pitch is a slider. ... The infield is one of the best in the NL with shortstop Trevor Story, second baseman DJ LeMahieu, the NL batting champion by a point over the Nationals' Daniel Murphy, and third baseman Nolan Arenado, infielders that have won a combined five Gold Gloves. ... Black knows his job is a tough one, but said he took the job because of the pitching depth on the roster. Pitching in Coors Field is a mental hurdle and nothing more, Black says. As a former pitcher, as well as manager in San Diego, Black has plenty of experience in Coors Field.

LOS ANGELES: The Dodgers, under manager Dave Roberts, will be going after their fifth consecutive NL West title after retaining three of their key players from a team that lost to the Cubs in the NL Championship Series. The Dodgers kept Jansen, starter Rich Hill and third baseman Justin Turner. ... Jansen, 29, had a career-high 47 saves for the Dodgers. Hill, 37, is a gamble given his injury history, but after his 2.12 ERA in six starts last season, the Dodgers are banking on him to be a No. 2 behind lefty ace Kershaw, who had a 1.69 ERA in 2016. ... After Kershaw and Hill, the Dodgers' rotation includes lefty Julio Urias, 20, who has the potential to lead the rotation. He's unique because he's mastered his changeup, one of the most difficult lessons for a young pitcher to learn. ... At 31, Turner is a late bloomer but has developed into a tough middle-of-the-order hitter with 27 home runs last season. He's the heart of the team and a good on defense. ... Shortstop Corey Seager hit .308 last season and is the type of player that can do everything. He's going to be an MVP-type for a long time. ... The new second baseman is Logan Forsythe, who hit .264 with 20 home runs for the Rays last season, an upgrade over Chase Utley. ... The key to the bullpen will be Sergio Romo, who was key member of San Francisco's three World Series title teams. Romo, 33, had a flexor strain that limited him to last season. ... Another question: Will outfielder Yasiel Puig be disciplined enough to live up to his potential and hit consistently?

SAN DIEGO: The Padres' thin rotation is banking on a comeback from Jered Weaver, who spent 11 seasons with the Angels with a 3.55 ERA and 195 wins. Weaver slumped to a 5.06 ERA last season. ... The Padres are working with backup catcher Christian Bethancourt to be a pitcher. "He's got a strong and accurate arm and he's taken big steps,'' Padres manager Andy Green says. ... The Padres' best hitter is first baseman Wil Myers, 26, who signed a six-year, $86 million contract in January after having his best season in 2016, hitting .259 with a .336 on-base percentage, 28 home runs and 84 RBI. ... The prospect to watch is catcher Austin Hedges, who hit .326 with 20 home runs at Triple-A El Paso last season. Hedges gets a chance after the Padres traded Derek Norris to the Nationals. Hedges has the potential to hit 20 home runs. ... The Padres are expecting Luis Perdomo to build on his breakout rookie season. He had a 4.30 ERA in the second half, cutting it by half from the first half of the season.

SAN FRANCISCO: Despite a leaky bullpen that blew 30 saves and 16 leads after the seventh inning last season, the Giants had 87 wins and lost their Division Series to the Cubs in four games. Fittingly, the bullpen gave up a four-run lead in Game 4. ... Former National Melancon, who signed a $62 million contract, should solve the Giants' ninth-inning problems. ... The Giants' core -Bumgarner, Buster Posey and Brandon Crawford - are in their prime. ... Catcher Posey, shortstop Crawford and second baseman Joe Panik are strong up the middle on defense, but the Giants are concerned that Denard Span, 33, is aging and losing steps in center field. Span's on-base percentage was .331 last season, and he's not the base-stealing threat he was when he played for the Nationals. ... Bumgarner (15-9, 2.74 ERA last season) leads a rotation that includes Cueto (18-5, 2.79), Jeff Samardzija (12-11, 3.81) and lefty Matt Moore (13-12, 4.08). That's about as good of first four as a team can have. ... The Giants' sparkplug is outfielder Hunter Pence, 34 in April. If he's healthy, they usually win. He played in 162 games in 2014 and they won the World Series. Injuries limited him to 52 games in 2015 and 106 last season. He did come back strong in the final month, hitting .307 with a .373 on-base percentage.