The first rule of Opening Day: Don't overreact to Opening Day. So these are merely observations from flipping around watching a bunch of different games.

1. At one point during the Cardinals-Reds opener, Adam Wainwright looked a little perturbed, presumably at the strike zone of plate umpire Gary Cederstrom. After all, Wainwright walked three guys unintentionally in his seven innings (plus another intentional walk). This was a guy who walked just 35 batters in 34 starts last year, just once walking three guys in a game. So he may have been unhappy with the balls and strikes … and yet still threw seven scoreless innings with nine strikeouts and just three hits allowed in the Cards’ 1-0 victory. Whenever the Reds threatened, Wainwright got the big outs -- a Joey Votto double play on a 2-2 fastball in the third and Zack Cozart on a tapper in front of the plate with two runners on to end the sixth. He threw 105 pitches, including 22 of his famous curveball -- the Reds went 0-for-6 with a walk against the curve, including Cozart’s out. Here’s the thing about the Cardinals: While I (and others) have spent a lot of time discussing their depth and versatility, they also have two of the best players in the game: Wainwright and Yadier Molina. Their lone run off Johnny Cueto: Molina’s home run in the seventh off a 0-0 cutter that didn’t cut.

2. I don’t know if Billy Hamilton will hit, but I know he can’t hit Wainwright. The Reds’ rookie went 0-for-4 with four strikeouts against Wainwright to register the dreaded golden sombrero -- the 17th player since 1914 to go 0-for-4 with four strikeouts on Opening Day. The potential bigger picture: If Hamilton and Brandon Phillips don’t get on base enough -- a distinct possibility -- Votto is going to draw 100-plus walks no matter if he has Jay Bruce, Johnny Bench or Frank Robinson hitting behind him. Which will lead to the haters complaining about Votto’s RBI total.

3. The Tigers beat the Royals 4-3 thanks to a big day from emergency shortstop acquisition Alex Gonzalez, who tripled in the tying run in the seventh and singled in the winning run in the ninth. Justin Verlander scuffled through his six innings, giving up six hits and three walks with just two strikeouts, but that’s not my initial concern. The concern is that Opening Day roster, which includes Gonzalez, Andrew Romine, Bryan Holaday, Tyler Collins, Don Kelly, Ian Krol and Evan Reed. Besides Krol and Reed, the bullpen includes Phil Coke (1.6 WHIP over the past two seasons), Joba Chamberlain, Al Alburquerque and Luke Putkonen. In other words: The final 10 spots on the roster could be a disaster. It could work out -- Chamberlain and Alburquerque will probably be OK if they stay healthy, for example -- but the lack of depth on this team could be an issue. Detroit's star players -- Verlander, Miguel Cabrera and Max Scherzer -- have been very durable, but a lengthy injury to any of those three or Anibal Sanchez, Austin Jackson or Ian Kinsler could be crushing.

4. The Pirates picked up with the kind of game they won last year, beating the Cubs 1-0 on Neil Walker’s walk-off home run in the 10th inning. The Pirates won five 1-0 games last year (there were only 48 such games in the majors last season, so the Pirates had over 10 percent of all 1-0 victories). The major league average when scoring one run, two runs or three runs was a .270 winning percentage; the Pirates were 25-39 (.390) when scoring one to three runs, so they won a lot of low-scoring games. The big positive besides the bullpen throwing four scoreless innings was the six dominant innings from Francisco Liriano, who tied a Pirates club record with 10 strikeouts on Opening Day. With the loss of A.J. Burnett, the pressure is on Liriano to repeat his 2013 performance.

5. Showing early confidence in B.J. Upton, who hit .184 last year while striking out in 34 percent of his plate appearances, Braves manager Fredi Gonzalez hit his center fielder second while moving Justin Upton down to fifth (Chris Johnson hit cleanup). I can’t say that’s the lineup I’d go with -- Justin Upton seems the logical choice to bat second behind leadoff hitter Jason Heyward -- but no matter what order Gonzalez chooses there are going to be some OBP issues if B.J. Upton, Dan Uggla and Evan Gattis don’t get on base more often. Yovani Gallardo kept the Braves in check with six shutout innings -- a good sign for the Brewers considering Gallardo’s inconsistency and drop in velocity last year -- while Francisco Rodriguez was called on for the save in the Brewers’ 2-0 victory.

6. One reason I’m a little wary about the Orioles is new closer Tommy Hunter’s struggles against left-handed batters -- he gave up 12 home runs last year, which is way too many for a reliever to begin with, and all 12 were against lefties. He scraped through the save in the O’s 2-1 win over the Red Sox, hitting Will Middlebrooks with a pitch and giving up a one-out single to Dustin Pedroia, but he got ahead of David Ortiz 0-2 before getting him to fly out to medium-deep left center, and then struck out Jackie Bradley looking on a fastball at the belt. (Bradley was hitting after pinch running for Mike Napoli in the eighth).

7. I was dubious about Tanner Scheppers as a starter and his performance in the Rangers’ 14-10 loss to the Phillies didn’t alleviate any of those concerns. His fastball averaged 96.3 mph last year as a reliever but 93.3 on Monday as a starter. His strikeout rate as a reliever didn’t scream “try this guy as a starter” and he fanned just two in his four innings, which required 93 pitches to get through. It's just one start and considering it was his first in the major leagues and on Opening Day -- a strange choice by Ron Washington -- let’s give him a pass and keep an eye on his next outing.

8. Tough loss for the Mets, blowing leads in the seventh and ninth innings and then losing in 10 to the Nationals. As Mets broadcaster Gary Cohen said after Anthony Rendon hit a three-run homer off John Lannan in the 10th, “What an atrocious day by the Mets' bullpen.” Something Mets fans have witnessed all too often in recent seasons.

9. While flipping through the various games, it’s pretty clear we're going to see even more defensive shifting. According to Baseball Info Solutions, the number of shifts has increased from 2,358 in 2011 to 4,577 in 2012 to 8,134 in 2013.

10. Jose Fernandez. He looked brilliant in his six innings, throwing 73 of his 94 pitches for strikes, and smiling when Carlos Gonzalez homered in the sixth off his one mistake. I think I may watch 33 Marlins games this year.
espn.go.com/blog/sweetspot/post/_/id/45473/ten-observations-on-opening-day-games