Disagree with this odds.

Rayo Vallecano is clearly overperforming, as they did last season with an amazing first part and a very poor second part, with relegation numbers. They are a team made to avoid relegation, not to fight for Europe or be in the TOP10.

Have a weak defense with 18 goals conceded in 15 games, mainly because are an offensive team. They were in good form before the WC break but it has not been good for them, as were outplayed by Girona (2:2) and lost against Sporting in the Cup (a team from 2nd division).

On the other hand Betis is a top team, able to fight for the 4th position (Champions League). Have a team with a lot of quality, good bench, automatisms and tactics, solid defense and strong attack.

Their problem is that this season are struggling to show a good level playing away, where they have won just 2 games out of 7 played so far, but have potential to do it much better.

They aren’t in the best form, especially some players like Canales, but have a lot of quality to improve and I believe that sooner or later we’ll see the best version or Betis, which is a very difficult team to beat.

Last season Betis outplayed Rayo in the league winning 3:2 and 1:1 (receiving a red card at 30’) and in the Cup, beating Rayo deservedly thanks to a victory 1:2 and a draw 1:1 in the second leg at home.

Betis has much more quality and potential to improve, while Rayo is already at the top of their potential so I’m not expecting some surprise here. Rayo could win, but in normal circumstances Betis will dominate and have the control of this match. This added to their quality should be enough to achieve the victory here.

本译文使用有道机器翻译，仅供参考：

不同意这种可能性。

雷约·巴列卡诺显然表现超群，就像他们上赛季一样，上半赛季表现出色，下半赛季表现糟糕，保级数据很差。他们是一支为保级而生的球队，而不是为欧洲而战或进入前十。

防守薄弱，15场比赛丢18球，主要是因为是一支进攻型球队。他们在WC赛前状态很好，但这对他们来说并不好，因为他们被赫罗纳(2:2)击败，在杯赛中输给了竞技队(一支来自乙级联赛的球队)。

另一方面，贝蒂斯是一支顶级球队，有能力争夺第4的位置(冠军联赛)。拥有一支高质量的球队，好的板凳，自动和战术，坚固的防守和强大的进攻。

他们的问题是，本赛季他们在客场努力表现出良好的水平，到目前为止，他们在7场比赛中只赢了2场，但他们有潜力做得更好。

他们的状态不是最好的，尤其是像卡纳莱斯这样的球员，但他们有很多能力需要提高，我相信我们迟早会看到最好的贝蒂斯，这是一支很难击败的球队。

上个赛季，贝蒂斯在联赛中以3:2和1:1的比分击败了拉约(在30分钟时吃到红牌)，在杯赛中以1:2的比分击败了拉约，在第二回合主场以1:1的比分战平。

贝蒂斯有更多的实力和潜力需要提高，而拉约已经是他们潜力的巅峰，所以我不期待会有什么惊喜。拉约可能会赢，但在正常情况下，贝蒂斯将会主宰并控制这场比赛。这一点加上他们的素质应该足以在这里取得胜利。