Four of the five National League West teams got an up-close look at each other during the first week of the season, when the Giants, D-backs, Padres and Dodgers all played each other. 

Meanwhile the Rockies opened with games against the NL East Marlins and AL East Rays.

Not surprisingly, the Dodgers had the most impressive week of the bunch, with series wins against the D-backs and Giants, while the Padres looked much improved over the previous few seasons.

It’s far too early to make any hard and fast judgements about any of these teams of course, but it’s never too early to start gathering information. Here's one thing we learned about each team and one question that still needs to be answered.

D-backs

One thing we learned so far: Christian Walker opened eyes with an impressive start to the season, so much so the team moved Jake Lamb back over across the diamond to third base in order to get both their bats in the lineup. Especially now, with Lamb looking at a possible stint on the injured list, Walker is going to get far more playing time than we might have first thought.

One thing we still don’t know: The D-backs' offense struggled during the spring and with the loss of Paul Goldschmidt and A.J. Pollock, it looked as though scoring runs might be an issue. However, in the first six games of the season the D-backs scored at least five runs in every game. Whether that can continue remains to be seen.

One number: 31.50 -- That’s catcher John Ryan Murphy’s ERA. That he had to pitch in the season’s third game -- an 18-5 loss to the Dodgers -- sums up the struggles of the starting pitchers the first turn through the rotation.

Dodgers

One thing we’ve learned so far: The Dodgers haven’t forgotten how to hit home runs. In the four-game season-opening series with Arizona, they slugged 14 of them, a record eight on Opening Day. Cody Bellinger led the attack with four in that series and five in the first six days. It’s a promising start for the 2017 NL Rookie of the Year, who struggled at times his sophomore season.

One thing we still don’t know: How long will it take for Kershaw (left shoulder inflammation) and Hill (strained left knee) to return to the rotation, and when they return, will they be ready? Kershaw has a rehab start scheduled for Thursday and, if history is an indicator, he will try to return immediately. Hill, at age 39, vows to err on the side of caution in his return.

One number: 1.206 -- That was A.J. Pollock’s OPS in the season-opening four-game series against his former team, the D-backs.

Giants

One thing we've learned so far: The Giants' pitching staff is going to be effective. Through their first turn in the rotation, Madison Bumgarner, Derek Holland, Dereck Rodriguez, Jeff Samardzija and Drew Pomeranz combined to allow nine earned runs over 26 innings (3.12 ERA). Only Bumgarner went longer than five innings in his season debut, but the Giants have a deep and talented bullpen that can provide coverage on days when their starters don't pitch deep into games.

One thing we still don't know: Will the Giants' offense be able to produce enough runs to consistently support their pitchers? They scored only five runs over their four-game opening series in San Diego before using timely hitting to rally for a 4-2 win over the Dodgers on Monday. The Giants' pitching is good enough to keep them in games, but their offense will have to come through with big hits to keep them competitive. 

One number: 1.13 -- The Giants' bullpen ERA through their first five games of the season. Led by closer Will Smith, Tony Watson and Reyes Moronta, the relief corps has been as stingy as everyone thought they would be. 

Rockies

One thing we’ve learned so far: Getting better offensively is not simple. New hitting coach Dave Magadan was brought in to improve the approach and Daniel Murphy was signed to exemplify it. But Murphy is out for a month with a broken finger, and the offense has scored one or fewer runs in each of its last four games.

One thing we still don’t know: The Rockies lost a big piece of their bullpen when Adam Ottavino signed with the Yankees. While they believe their bullpen will be a strength, they have yet to really be tested much when it comes to protecting a narrow lead late in the game.

One number: 39 -- The number of times the Rockies struck out in their last three games against the Rays.

Padres

One thing we've learned: The stage isn't too big for the Padres' youngsters. Fernando Tatis Jr. had two hits in his debut, becoming the youngest player with a multi-hit game on Opening Day since Robin Yount in 1975. Then he homered on Monday night. Chris Paddack, meanwhile, retired the first 10 big league hitters he faced in his debut Sunday and struck out seven over five excellent innings.

One thing we still don't know: How are the Padres going to split time in their outfield? It sure seems like Franmil Reyes and Wil Myers are the preferred corner options. Does that leave Hunter Renfroe exclusively as a bench bat? Does Franchy Cordero fit as a center fielder only, or will he see time in the corners, too? And if Cordero’s a center fielder, what does that mean for Manuel Margot?

One number: 24 -- It’s the average age of the Padres’ starting rotation, the youngest in baseball.